# Math Check

Can you please see if you got the same answer as I did? Thank you.

3/x + 2/x-4

3x-12=2x
subtract 3x from both sides you get -12=-1x divide by -1 final answer is 12.

1. 👍 0
2. 👎 0
3. 👁 74
1. yes, the solution to 3x-12=2x
is x = 12

but ...

how did 3/x + 2/x-4
magically turn into the equation
3x-12=2x ????

1. 👍 0
2. 👎 0
posted by Reiny
2. I multiplied each fraction by (x)(x-4)

1. 👍 0
2. 👎 0
posted by Justine
3/x = 2(x-4)

cross-multiplying would have given you
3x - 12 = 2x

ok, looks like a simple typo.

1. 👍 0
2. 👎 0
posted by Reiny
4. 3/x+ 2/x-4 = 3(x-4)+ 2(x)=0
3x-12+2x=0
3x+2x=12
5x=12
x=12-5
x=7
or only if you cross multiply the 3*x-4 which is 3x-12 and put it equal to 2*x which is 2x that could work.

1. 👍 0
2. 👎 0
posted by j

## Similar Questions

Find the length of the 3rd side of each right triangle. 1. 8^2+15^2=c^2 Answer: c=17 2. 5^2+b^2=13^2 Answer: b=12 3. 9^2+13^2=c^2 Answer: c~15.81 Simplify. Assume that all variables are nonnegative. { this means square root 4. {12

asked by Joy on January 20, 2009

Add or Subtract (Radicals) { this means squared 1.3{2 + 4{2 Answer: 7{2 2. 8{3 + 3{3 Answer: 11{3 3. 7{5 - 3{5 Answer: 4{5 4. 8{2 - 5{2 Answer: 3{2 5. 6{x + 7{x Answer: 13{x 6. 9{y + 3{y Answer: 12{y Multiply 7. -3x^2(4x^2-3x-5)

asked by Joy on January 20, 2009
3. ### Math 8R: Homework Check - Part 2

Part 2: Simplify by combining like terms and using the distributive property 11. 3x + 5x Answer: 8x 12. 3x + 5y - 2x + 8, Answer: 1x + 5y + 8 13. 9 + 5m + 6b - 2m - 4, Answer: 3m + 5 + 6b 14. 3ab + 6c - ab + 10 - 2c, Answer: 2ab +

asked by Laruen on October 28, 2012

Write each expression in simplest form. ( means square root 4. 3(11 + 4(11 Answer: 8(11 7. 7(2 - 2(8 Answer: 1(2 ?? 8. (48 + (75 Answer: 9(3 9.(3(10) Answer: 19 + 6ã10 10. (27/64 (Fractions) Answer: 3(3/8 ?? 11.

asked by Joy on January 14, 2009

Change each decimal to a fraction in lowest terms. 1) 0.4242.... Answer: 14/33 2)0.58 Answer: 29/50 3)0.14 (Repeating sign over both numbers) Answer: 14/99 Write each expression in simplest form. ( means that it is inside a square

asked by Joy on January 13, 2009
6. ### Math

asked by Cassidie on October 1, 2013
7. ### Algebra

Can someone check my algebra answers and help me with the problems I don't understand? 1. n^2-n-20/2n^2 times n^2+5n/n^2-25 answer: n+4/2n 2. (2x-6/21)/(5x-15/12) answer: 8/35 3. 5x-3/6 - x+3/6 answer: 2x/3-1 4. 5x/26 - 2x/13

asked by Alexandria on June 24, 2007
8. ### Matt 115

Hello, I just wanted to know if someone could check my work to see if they are right or wrong. Thanks :) 5. Find 2/5 of 4/11. Answer: 8/55 8. Are 3/21 and 3/54 equivalent fractions? Answer: No 14. Write in decimal form 8

asked by Angela on January 19, 2010
9. ### Algebra

Hiya. I have 7 expressions that I have been asked to simplify. I worked all of them out, and if you could, I'd like you to check my work for me. Here they are: 1. (x^2 + 3x - 9) + (-4x^2 + 2x - 3) My answer: -4x^4 + 5x - 12 2. (x

asked by Kathy on February 20, 2014