Saturday

April 19, 2014

April 19, 2014

Number of results: 93,521

**Algebra**

find least common denominator for these fractions 5/7 and 4/6
*Friday, February 8, 2013 at 2:55pm by Corey*

**math 4th grade**

Find a common denominator.
*Tuesday, April 16, 2013 at 8:06pm by Shawn*

**Math**

You must make a common denominator. 1. Find the lcm of the denominators 2. Multiply the denominator by the number that makes it the lcm (ex. 2/3 plus 2/4 lcm o 3 and 4 is 12. 3x4= 12. 4x3=12) 3. add them up!
*Tuesday, October 12, 2010 at 7:12pm by Heather*

**Chemistry **

Calculate the energy involved in the transition of an electron in the hydrogen atom from level 5 to level 2. Use the energy to calculate the wavelength of electromagnetic radiation emitted. However, do not change the fractions to lowest common denominator. Determine (1/nf^2 - ...
*Saturday, November 5, 2011 at 10:17pm by Anonymous*

**Math**

You are going to have to find a common denominator for the fraction parts of those numbers before adding them. The common denominator is 27x7 = 189 26/27 = 182/189 5/7 = 135/189 5/9 = 105/189 Sum of fractions 422/189 = 2 44/189 Add to that the sum of the integers 1,8 and 12 (=...
*Tuesday, December 9, 2008 at 11:21pm by drwls*

**algebra**

(x + 1) / (x - 1) - 2 / (x^2 - x) = 0. Common denominator = (X^2 - x). (x^2 + x - 2) / (x^2 - x), Factor numerator and denominator: (x - 1) (x + 2) / x(x - 1), Cancel the (x - 1) factors and get: (x + 2) / x = 0, Cross multiply: x + 2 = 0, x = -2. Check: (-2 + 1) / (-2 -1) - 2...
*Sunday, December 5, 2010 at 10:31pm by Henry*

**Math**

first simplify to lowest terms, so the frist fraction is 4 3/5. then we find least common denominator, so least common multiple of 5 and 4 is 20. we times first fraction by 4 and second by 5. thus we get 4 12/20 and 3 15/20 then we convert to improper fraction to get 4*20 + 12...
*Thursday, February 21, 2013 at 5:57pm by Knights*

**math help**

11 1/2 + 2 9/16 = change to improper fractions. (23/2 + (41/16) = find the common denominator of 16 (184/16) + (41/16) = add numerators (184 + 41)/16 = 225/16 = reduce to lowest terms. I don't see anything that will divide into both 225 and 16 to reduce it. Check my thinking. ...
*Saturday, October 13, 2007 at 8:50am by DrBob222*

**Algebra**

a. First, turn the left side of the equation into a single fraction, by using a common denominator. 1/3 - 5/6 = (2-5)/6 = -3/6 = -1/2 That leaves you with -1/2 = 1/x -x = 2 x = ? b. t + 1/3 -t -1/2 = 1 has no solution, because the t terms cancel out, leaving you with a false ...
*Tuesday, June 30, 2009 at 11:19pm by drwls*

**Math - Urgent**

hint: What is your common denominator? multiply each term by that denominator and see how easy your question becomes.
*Wednesday, October 23, 2013 at 7:21pm by Reiny*

**Math**

find equivalent fraction with a common denominator 2/3,1/2,5/12
*Tuesday, March 24, 2009 at 7:02pm by Maya*

**math**

find a common denominator! or you can add their exponents like, 1/5 = 5^-1
*Tuesday, April 27, 2010 at 6:59pm by Jennifer *

**math**

find the equivalent fractions with the common denominator of 12
*Monday, November 1, 2010 at 11:14pm by stef*

**math**

To get the mean, find the common denominator, add and divide by 3.
*Tuesday, January 25, 2011 at 7:57pm by PsyDAG*

**Math**

Edit: (1/c+2) + (1/0.30c+0.60) = ?? How do i find a common denominator for this? thank you.
*Tuesday, February 8, 2011 at 2:20am by cody*

**Algebra**

Please explain to me how to do these problems...Thanks 1. Find the value of x...x/6-x/8=1 2. The combined resistance of two resistors r1 and r2 in a parallel circuit is given by the formula rt= 1/(1/r1)+ (1/r2)...simplify the formula... 3. Fungicides account for 1/10 of the ...
*Wednesday, May 23, 2007 at 1:09pm by Algebra Help*

**Math**

1st Step: Find Least Common Denominator, which is 6. Convert each number to equivalent fraction with denominator 6. 1/3 + (-5/6) + (-1/2) = (1/3)(2/2) + (-5/6) + (-1/2)(3/3) = 2/6 + (-5/6) + (-3/6) Convert all addition operations followed by negative numbers to subtraction of ...
*Wednesday, December 19, 2007 at 1:18am by Cathy*

**Maths**

Write the following expression into its simplest form? (1/x-1-1/xsquare-1-1/x+1-4/xsquare+1)/ xraise to 4/xsquare-1 Let's use the symbol ^ to mean "raised to the power of" when using exponents. I'll try to decipher your expression: [1/(x - 1) - 1/(x^2 - 1) - 1/(x + 1) - 4/(x^2...
*Tuesday, November 21, 2006 at 8:42am by Nawaf*

**SAT math**

Since x^2-4x+3 = (x-3)(x-1) and (3-x) is just -(x-3) The LCD is 2(x-3)(x-1) So, TRUE Dunno why they included the "-" in the denominator, but it works with or without it. Similarly, FALSE for the 2nd The wording is poor. You can't have an LCD for "each" denominator. It takes ...
*Friday, May 31, 2013 at 12:07pm by Steve*

**maths**

5/30 Divide the numerator and denominator by 5 to find the fraction in its lowest terms. 5/30 = 1/6
*Monday, November 26, 2007 at 11:59am by Ms. Sue*

**math**

You can either change all of the fractions to decimals or you can get common denomiators. You wil work with smaller numbers if you change 4/6 to 2/3 4/8 to 1/2 Now, you need a common denominator for 2/3 1/2 3/4 5/8 24 would work as your denominator. Once you have the fractions...
*Tuesday, March 12, 2013 at 5:58pm by Dr. Jane*

**Math**

x/(x-2) + (2x)/[4-(x^2)] = 5/(x+2) This calls for finding the common denominator, and then solving for x using the numerators. Do not forget to exclude the asymptotes values of x where the denominator becomes zero. LCM (lowest ommon multiple) of denominators (x-2), (4-x²...
*Friday, July 12, 2013 at 2:49pm by MathMate*

**Math-Definition**

If you have fractions with different denominators, thn it's kinda like comparing apples and oranges. By finding a common denominator, you convert both fractions into something that can be compared. e.g. 2/5 + 1/2 = 4/10 + 5/10 = 9/10 Without finding that common denominator, ...
*Thursday, February 4, 2010 at 5:55pm by Jez*

**Math**

Shelly and Marcom are selling popcorn for their music club. Each of them received a case of popcorn to sell. Shelly has sold 7/8 of her case and Marcon has sold 5/6 of his case. Which of the following explains how to find the portion of popcorn they have sold together? A.Add ...
*Thursday, November 8, 2012 at 7:45pm by Jerald*

**SAT Math**

True or False: The least common denominator of each denominator in the following rational expression is (z-4)(z+4)(z-1)(z+1): 8 / z^2+5z+4 = 1 / z-4 + 1 / z-1 I am stuck on this one...
*Friday, May 31, 2013 at 2:28pm by mysterychicken*

**Algebra 1**

How do you find a common denominator when subtracting whole numbers and fractions?
*Monday, January 14, 2008 at 8:26pm by Ashley*

**math**

start by changing them to improper fractor and then find a common denominator.
*Thursday, March 20, 2008 at 10:36pm by Trissy*

**Mathbegining and intermadiate algebra**

12/5 - 1/1 find the common denominator and then subtract
*Monday, February 9, 2009 at 6:57pm by y912f*

**algebra 8th**

Do you know how to find the common denominator and change both fractions?
*Tuesday, August 31, 2010 at 9:34pm by Jen*

**math**

Next, find the common denominator and the equivalent fractions.
*Wednesday, October 27, 2010 at 7:25pm by Ms. Sue*

**math**

I'll show you the first two. 1. Find the LCD of 3/5 and 1/6. a. 5 b. 6 c. 11 d. 30 The LCD is the smallest number divisible by both denominators. Let's look at the multiples of 6: 6, 12, 18, 24, 30. The only one of those numbers that's also divisible by 5 is 30. 2 Add the ...
*Wednesday, August 29, 2012 at 12:45pm by Ms. Sue*

**math**

Ms. Sue is correct. The lowest common multiple is 9x7x2 = 126 in this case, because the three numbers do not have any prime factors in common.
*Tuesday, May 12, 2009 at 9:06pm by drwls*

**Precalculus**

remember to add/subtract fractions we need a common denominator. let's write our expression in factored form 1/x - 2/(x^2 + x) + 3/(x^3 - x^2) = 1/x - 2/[x(x+1)] + 3/[x^2(x-1)] so the common denominator is x^2(x+1)(x-1) first term: x(x+1)(x-1)/[x^2(x+1)(x-1)] notice if we ...
*Tuesday, January 5, 2010 at 9:58pm by Reiny*

**algebra**

This question has nothing to do with trigonometry. It is algebra. If D is the one-way distance, in miles, D/20 + D/24 = 2 hours The lowest common denominator is 120. 6D/120 + 5D/120 = 11D/120 = 2 D = 240/11 = 21.81 miles
*Sunday, December 12, 2010 at 11:52pm by drwls*

**math**

what is the least common denominator? It is the smallest number into which all of the denominators in a series of fractions can be evenly divided. For instance, is you have fractions 1/2, 2/3 and 5/6, the denominators are 2, 3 and 6, and the least common denominator is 6. The ...
*Tuesday, August 1, 2006 at 1:47am by megan*

**Math**

Hi How do I add x/(x+1) + x^3? How do I divide those two numbers as well? adding: get a common denominator, x+1 x/(x+1) + x^3(x+1)/x+1 x(1 + x^3 + x^2)/(x+1) divide? I am not certain what you mean. Thank you so much! What I mean is how do I divide x/(x+1) by x^3? The answer to...
*Saturday, March 3, 2007 at 12:47pm by Lisa*

**Math**

nope. 20 is not the common denominator,, on the given, i think you mean 3/(w+4) + 4/5w ,, first thing, multiply BOTH the numerator and denominator of the terms with their common denominator, which is (w+4)(5w),, therefore, (3/(w+4) + 4/5w)*(5w)(w+4)/(5w)(w+4) ==> some terms...
*Sunday, August 8, 2010 at 9:02pm by jai*

**math**

12 1/3 + 7 7/15 switch fractions to improper fractions then find a common denominator to find improper fraction of 12 1/3 multiply whole number (12) by the denominator of the fraction (3) then add the numerator of the fraction (1) therefore improper fraction will be 37/3
*Wednesday, April 25, 2007 at 6:32pm by Freddie*

**Math**

I still do not understand fractions?????? 2/3 + 1/3 + 5/6 = divide all of them first then add them up ???. I am still lost, can someone please help me. Ok. In your earlier question, there was talk of the LCM, the least common multiple. Whenever you add fractions, the ...
*Wednesday, March 21, 2007 at 6:19pm by Andre*

**MATH**

X+6=19 X-7Y=-7 I cant remeber how to do this but think i need to find a common denominator?
*Thursday, December 3, 2009 at 10:13am by Debbie*

**Math-Definition**

Why must we find a common denominator when add/subtract fractions?
*Thursday, February 4, 2010 at 5:55pm by Scott*

**algebra 8th**

you have to find a common denominator for both 2/5 7/8 2/5*---=19/40
*Tuesday, August 31, 2010 at 9:34pm by maria*

**mathh**

What is your answer? Remember to find a common denominator before you add.
*Wednesday, October 20, 2010 at 8:58pm by Ms. Sue*

**math**

Find the LCM of all those numbers. The answer will be the common denominator.
*Monday, July 11, 2011 at 1:14pm by Max*

**math**

find equivalent fractions with a common denominator and order from least to greatest 3/7 ,1/9 ,2/3
*Thursday, December 15, 2011 at 8:19am by sami*

**Math**

When Multiplying Fraction You Must Find A Common Denominator. True Or False
*Thursday, April 4, 2013 at 9:24pm by Zhanise*

**math please help:asap**

What did you find was the common denominator in your (Kim's) post?
*Tuesday, May 28, 2013 at 5:01pm by Ms. Sue*

**9th grade math**

3 5/8 - 1 3/4 To do this, first we convert the mixed numbers to improper fractions. To convert we multiply the denominator (the number under the line) by the constant then add this answer to the numerator (number above the line), while retaining the denominator. Doing this, 3 ...
*Thursday, July 26, 2012 at 3:01am by Jai*

**math**

1/a-1/b ------- a/b-b/a please simplify triple decker fraction you will have a common denominator of ab for the top and a common denominator of ab for the bottom, so they will cancel remember that to divide one fraction by another, you multiply the first by the reciprocal of ...
*Thursday, April 19, 2007 at 7:22pm by cody*

**SAT math**

True or False: The least common denominator of each denominator in the following rational expression is -2(x-3)(x-1) : 8 / x^2-4x+3 = 1 / 3-x + 1 / 2 FALSE? True or False: The least common denominator of each denominator in the following rational expression is -2(x-1) : 8 / x^...
*Friday, May 31, 2013 at 12:07pm by mysterychicken*

**math**

The variables m or n cannot be equal to 0. (You cannot have a 0 in the denominator.) 4/mn * m/2 = 4m/2mn Reduce the fraction. (Hint: common factors in the numerator and denominator are 2 and m.) I hope this will help.
*Monday, December 3, 2007 at 5:19pm by MathGuru*

**Radical expressions**

Multiplication of Rational Numbers: 1. Consider the factors of the numerator and of the denominator. 2. If there are factors common to the numerator and the denominator, reduce by dividing out the common factors. 3. Multiply all the numerators together and multiply all the ...
*Monday, January 2, 2012 at 7:42pm by -Untamed-*

**algebra 8th**

first get the least common denominator (LCD),, what is the common multiple of 5 and 8, or what is the smallest number in which it is divisible by 5 and 8? i get LCD = 40 :this is the denominator therefore, for the numerator multiply 40 to the fractions: 40[2/5 - 7/8] 2(8)-7(5...
*Tuesday, August 31, 2010 at 9:34pm by jai*

**math**

Find the equivalent fractions with a common denominator of 60. Or you could find the equivalent decimals.
*Tuesday, November 13, 2012 at 10:41pm by Ms. Sue*

**math**

the lest common denominator for the sum 3/8+5/12is 24 name a nother common denominatorthat you could use?
*Sunday, November 28, 2010 at 12:17pm by kay*

**algebra**

Could someone please help me to slove this question. (2y/x^2)+(7/x(x-3)) get a common denominator (x^2*x*(x-3)), combine the fractions. Notice there is a y in the first numerator, and no y's in the denominator. Consequently, there will not be a lot of simplification on this.
*Tuesday, July 17, 2007 at 11:44pm by Travell*

**math**

Add: 1/3+-5/6+ -1/2 First, find the common denominator, which is 6. 1/3 = 2/6 1/2 = 3/6 2/6 + 5/6 + (-3/6) = 7/6 - 3/6 = ? Don't forget to reduce your answer.
*Wednesday, October 15, 2008 at 6:50pm by Ms. Sue*

**6th grade math**

2/3 - 5/9 = First you need to find the common denominator and change 2/3 to 6/9 6/9 - 5/9 = ??
*Sunday, November 9, 2008 at 2:12pm by Ms. Sue*

**Math 115**

For each fraction, find the common denominator before you add or subtract.
*Sunday, January 25, 2009 at 7:55pm by Ms. Sue*

**math**

Find the least common denominator (LCD) for fractions with the given denominators. 1/3 + 5/12 + 4/5
*Friday, July 24, 2009 at 8:49pm by scooby91320002*

**6th Grade Math**

2 3/6 + 3 1/2 Find the common denominator. 2 3/6 + 3 3/6 = 5 6/6 = 7 _______________ 4 - 2 3/5 = 3 5/5 = 2 3/5 = 1 2/5 ______________________ 2/3 * 4/5 = 8/15
*Tuesday, January 12, 2010 at 8:35pm by Ms. Sue*

**math**

Find equivalent fractions with a common denominator and order from least to grestest 1/2, 4/9, 4/18
*Monday, March 21, 2011 at 5:41pm by gina*

**Essential Mathematics 1**

First, find the common denominator and change to an equivalent fraction. 7 1/3 = 7 2/6 = 6 8/6 6 8/6 - 2 5/6 = 4 3/6 = 4 1/2
*Monday, September 19, 2011 at 1:24pm by Ms. Sue*

**PREALGEBRA**

2 1/3 - 1 1/2 When adding and subtracting fractions, you first need to find a common denominator. 2 1/3 = 2 2/6 1 1/2 = 1 3/6 2 2/6 = 1 8/6 1 8/6 - 1 3/6 = 5/6
*Thursday, December 8, 2011 at 10:37pm by Ms. Sue*

**math**

find equivalent fractions with a common denominator and order from least to greatest.1/2 4/9 4/18
*Thursday, April 19, 2012 at 10:24pm by kaitlen*

**Math**

Find the least common denominator for the following fractions: 3/4, 19/20, 1/6, 3/5, 8/15
*Sunday, October 27, 2013 at 12:04pm by Rita*

**math**

change it to x^2 * (x-1)^-.5 d/dx= 2x*(x-1)^-.5 + x^2 * (-.5)*(x-1)^-1.5 now, common denominator of (x-1)^1.5 2x(x-1) -.5 x^2 all over denominator 2x^2-2x -.5 x^2=3/2 x^2-2x= (3x^2-4)/2 over denominator I agree with book answer.
*Wednesday, July 20, 2011 at 10:02am by bobpursley*

**calculus**

Suppose you had to add 1/(x-1) + 1/(x-2) + 1/(x-2)^2 your common denominator would be (x-1)(x-2)^2 in the same way if you had 1/(x-1) + 1/(x-2)^2 you would still have that same common denominator of (x-1)(x-2)^2 So when you are trying to reverse the process, how do you know ...
*Monday, June 6, 2011 at 8:41pm by Reiny*

**math**

Find the common denominator of the 7 and the 2 which is 14. 5/7 now becomes 10/14 and 1/2 now becomes 7/14. 10/14-7/14=3/14 Find common denominator for 3 and 7 which is 21. 1/3 now becomes 7/21 and 3/7 now becomes 9/21. 7/21+9/21=16/21 final problem is 3/14 X 16/21=48/294 ...
*Tuesday, February 1, 2011 at 11:35pm by Briella*

**mth**

We have a fraction in which a cubic Eq is the numerator and a Quadratic Eq is the denominator. Let's factor both. Find a value of X that gives 0 out when plugged into the cubic Eq. It was found by trial and error that -2 will give an output of 0 and,therefore, satisfies the Eq...
*Tuesday, March 1, 2011 at 12:47pm by Henry*

**math**

the sum of numerator and denominator is 3 less than twice the denominator.If the numerator and denominator is decreased by 1 , the numerator becomes half the denominator.Find the fraction?
*Wednesday, June 26, 2013 at 3:50am by amit*

**Math**

Don't let the negatives throw you! You need a common denominator. What's a common denominator of 6 and 10? 60. 9/10 = what/60 ? 1/6 = what/60? Now that you have them both in sixtieths, just add to get your answer. But since they were both negative, your answer will also be ...
*Thursday, November 5, 2009 at 6:41pm by jim*

**math**

Thanks, it's much easier when you pin-point the problem! In general, the coefficients of x and y are not the same between the two equations. When you want to eliminate y, and the coefficients are not the same, you find the LCM (lowest common multiple) of the two coefficients ...
*Monday, June 1, 2009 at 5:13pm by MathMate*

**Math grade 6**

4 times 3/8 is 12/8, which is 3/2 when reduced to lowest terms. If there are other x values, surely you can do them yourself. Multiply each one by four. If all numbers are fractions, multiply the numerators by 4, leaving the denominator unchanged. Reduce each fraction to ...
*Thursday, December 15, 2011 at 1:54am by drwls*

**math- please help!**

1. Rewrite (2/x) -1 in the numerator as -(x-2)/x Factor (x^2/4) in the denominator as (x-2)(x+2) Then cancel out the (x-2) terms in numerator and denominator. You wil be left with -1/[x(x+2)] 3. Rewrite x/y and y/x with a common denominator, xy. [(x^2- y^2)/xy]^-1 = xy/(x^2- y...
*Thursday, September 20, 2007 at 11:54pm by drwls*

**Math**

1) 20 : 18 = 10 : 9 2) ? 3) To solve this you need to find the least common denominator.
*Monday, August 18, 2008 at 9:28pm by Ms. Sue*

**math**

Find equivalent fractions with common denominator and order form least to greatest: 2/3, 1/2, 5/12
*Thursday, December 3, 2009 at 1:19am by sue*

**math(fractions)**

First, find the common denominator. What is the smallest number that's divisible by 15 and 6?
*Saturday, November 5, 2011 at 4:47pm by Ms. Sue*

**Math**

true. also, u can reduce each fraction to find common denominator faster and less messily
*Thursday, February 21, 2013 at 5:58pm by Knights*

**Math2(Please Help)**

4x 8 ___ - ______ x+2 x-1 *Simplify The Expression I'm going to assume your problem is this: 4x/(x+2) - 8/(x-1) Use a common denominator since the denominators are not the same. Common denominator is: (x+2)(x-1) Rewriting the problem, we have: 4x(x-1)/(x+2)(x-1) - 8(x+2)/(x+2...
*Saturday, March 3, 2007 at 9:56pm by Margie*

**math**

First, convert the fractions so that they have the same denominator. 7/9 = 14/18 5/6 = 15/18 14/18 + 15/18 = 29/18 = 1 11/18 http://www.mathsisfun.com/numbers/common-denominator.html
*Wednesday, February 16, 2011 at 12:00pm by Ms. Sue*

**math**

When adding fractions like 1/3 and 3/5, the Lowest Common Denominator is the smallest number that is a integer-multiple of both 3 and 5. In this case it would be 15. You would get the sum by adding 5/15 and 9/15 to get 14/15. The simplest from of a fraction is the form in ...
*Sunday, January 25, 2009 at 9:27am by drwls*

**math**

11/15+7/10-2/5 First, you need to find the common denominator. Since 30 is the smallest number divisible by 15, 30, and 5, then 30 is the common denominator. 11/15 = 22/30 7/10 = 21/30 2/5 = 12/30 22/30 + 21/30 = 43/30 43/30 - 12/30 = 31/30 = 1 1/30
*Monday, July 14, 2008 at 9:01pm by Ms. Sue*

**LCMs/Adding unlike fractions**

The LCM is that smallest whole number that each of your given numbers divide into 8 = 2x2x2 9 = 3x3 12 = 2x2x3 18 = 2x3x3 so looking at those, I will need three 2' and two 3's LCM = 2x2x2x3x3 = 72 As to your second one, 7 = 1x7 5 = 1x5 10 = 2x5 So your lowest common ...
*Sunday, October 9, 2011 at 9:05pm by Reiny*

**FRACTION MATH**

First, find the common denominator. Both 3 and 5 go into 15. Then change these fractions into equivalent fractions with the same denominator. 3 1/3 = 3 5/15 2 2/5 = 2 6/15 3 5/15 - 2 6/15 = 50/15 - 36/15 = 14/15
*Wednesday, August 11, 2010 at 9:21pm by Ms. Sue*

**Math**

ADDING AND SUBTRACTING: Need a common denominator DIVIDING: Multiply the numerator fraction by the inverse of the denominator fraction
*Wednesday, April 29, 2009 at 4:06pm by Bill*

**math 117**

x/6- x/8=1 Find a common denominator for the two x-terms on the left. Then do the subraction to get x/? = 1 You do the rest. These are not hard questions
*Wednesday, July 11, 2007 at 10:59pm by Diana*

**math**

Find the least common denominator (LCD) for fractions with the given denominators 13/15 - 11/20=2/5?
*Friday, September 11, 2009 at 1:47pm by A*

**Math**

Find common denominators. -7/6 is an improper fraction for -1 1/6. It doesn't matter whether the negative sign is in the numerator or the denominator.
*Thursday, March 25, 2010 at 10:26am by Hayes *

**algebra**

Find a common denominator, that is, multiply all fractions by x/x, then put the like terms together, and simplify:)
*Sunday, May 23, 2010 at 8:25pm by Libby*

**math 050**

Find a common denominator. It would be six and multiply both the numerator and the denominators by the # that will equal 6. then add.
*Friday, November 12, 2010 at 1:50am by M*

**fourth grade math**

1\2,4\9,4\18 find equivalent fractions with a common denominator and order from least to greatest
*Tuesday, December 14, 2010 at 12:48pm by jonathan*

**bobPursley2...the other one**

Problem 2: (x+2)/(2x^2+5x+2) - (x-3)/(2x^2-5x-3) What I did: 2x^2+5x+2 factors are (2x+1)(x+2) 2x^2-5x-3 factors are (2x+1)(x-3) Then: (x+2)/(2x+1)(x+2) - (x-3)/(2x+1)x-3) So the common denominator is (2x+1)(x+2)(x-3) using that combine the fractions. I already knew the common...
*Sunday, March 4, 2007 at 4:02pm by Margie*

**precalc**

The numerator can be written (x^-1 + y^-1)(x^-1 -y^-1) One of the factors cancels the denominator, leaving you with (x^-1 + y^-1) Using a common denominator xy, that can be rewritten (y + x)/xy
*Saturday, February 16, 2008 at 12:24pm by drwls*

**Algebra 2**

the common denominator would be (x^2-4(x^2-2), so (6)/(X^-4) + (5)/(X^-2) = [6(x^2-2) + 5(x^2-4)]/[(x^2-4(x^2-2)] = (11x^2 - 32)/[(x^2-4(x^2-2)] (are you sure the second denominator wasn't (x-2) ? it would have worked much better)
*Sunday, February 1, 2009 at 10:30pm by Reiny*

**algebra**

2/7 * 42/45 = 84/315 2/5 * 11/3 = 22/15, Multiply both numerator and denominator by 21 to get common denominator and add the two terms. Reduce, if possible.
*Tuesday, December 7, 2010 at 11:55am by PsyDAG*

**math**

well, easy think of some 1/2 + 1/2 = 2/2 = 1 1/3 + 2/3 = 3/3 = 1 sum of tops must equal denominator when denominators are the same that means you need to put them over a common denominator, but you have to do that to add them anyway.
*Wednesday, January 29, 2014 at 5:03pm by Damon*

**algebra homework**

I'm assuming both Ys are in the denominator: 3/y - 3/2y + 4 = Find common denominator: (6 - 3 + 8y) / 2y = (3 + 8y) / 2y = 3/2y + 8y/2y = 3/(2y) + 4.
*Friday, August 27, 2010 at 5:52pm by Anonymous*

**LCD**

Thank you for using the Jiskha Homework Help Forum. Hopefully, this will help: http://www.helpwithfractions.com/least-common-denominator.html
*Sunday, March 23, 2008 at 4:34pm by SraJMcGin*

**math**

http://www.helpwithfractions.com/least-common-denominator.html Let us know what you decide, and someone here will let you know if you're right or not.
*Thursday, July 31, 2008 at 6:09am by Writeacher*

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