Sunday

October 26, 2014

October 26, 2014

Posted by **Jasmine20** on Wednesday, January 24, 2007 at 10:42pm.

Directions: Divide

Problem:

(7x^5y^5-21x^4y^4+14x^3y^3)/(7x^3y^3)

Realize that you have 7x^3y^3 on the bottom. Now in order to get rid of that, you want to have the same thing in the top, multiplied by something else. That way, the 7x^3y^3 on the top and bottom will cross out, because any number over itself is 1. So, take out 7x^3y^3 from the numerator:

[7x^3y^3(x^2y^2-3xy+2)]/(7x^3y^3)

Now once you cross out the (7x^3y^3) from the fraction, you are left with x^2y^2-3xy+2. So, to factor this, you need the beginnings of the parentheses to be xy, so when you multiply xy times xy you will get x^2y^2.

(xy )(xy )

Now, you know that the ends of the parentheses must multiply to 2, so they will be 2 and 1, but we don't know if they are positive and negative yet.

(xy 2)(xy 1)

Now, you want the outer terms multiplied plus the inner terms multiplied to equal negative 3. So, if the 2 and 1 were positive, we'd end up with +3 and we want -3, so we know the signs inside must be negative:

(xy-2)(xy-1)

where did you get:

[7x^3y^3(x^2y^2-3xy+2)]/(7x^3y^3

the -3xy+2

I took out 7x^3y^3 from everything in the numerator. So, from the 7x^5y^5, I took out 7x^3y^3 and separated it from x^2y^2, because if you multiply those 2, you will end up with the original 7x^5y^5. I did the same for -21x^4y^4. If you remove from that 7x^3y^3 (basically, what will you multiply by 7x^3y^3 to get back to -21x^4y^4?), you will get -3xy. For the last part, 7x^3y^3 times 2 is the original, 14x^3y^3. Wow, that sounds way more confusing than it is. If you ask your teacher to show you it is much easier written and pointed out than me trying to explain it on here.

- math,algebra,help -
**Tina**, Monday, April 25, 2011 at 6:45pm3y divided by 7

**Answer this Question**

**Related Questions**

Algerbra - how do you solve 7(3x+4)=8(2x+5)+13 expand the parenthesis...I will ...

Question, in regards to math - My questions is this: Directions :create one ...

to bobpursley,math - This is what i have am i wrong or correct.Or how can word ...

algebra - I need help with this problem: Dividing 7x^5y^5-21x^4y^4+14x^3y^3/7x^...

algebra - find the product of (x^2-3x+5)with the quotient of (21x^6- 14x^5-7x^3)...

Math - I have 2 problems I need help with both I have narrowed it down to 2 ...

MATH...somewhat urgent - I have three problems I would like checked please.1: I ...

drbob222, math ,algebra - can you explain to me the following problem , ms.sue ...

math,algebra - Directions:Multiply (-1/2)(-3/8) mY ANSWER : .1875 Now how do i ...

math - how to work out -9x+17-10x=-21x+23 its 43 duhhhhhhhhhhhhhhhhhhhh that isn...