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April 26, 2015

Homework Help: Algebra

Posted by Sara on Friday, July 20, 2007 at 10:30am.

The answer in the book however says

-(5x^2-17x-9)/(x-3)(x+2)

so I don't know what I am doing wrong, can you take me step by step through the problem. I have a lot of problems, but I think once I understand what I am doing wrong with this one I can get the rest.

What was the original question?

The original problem was x/(x-3)-4-(2x-5)/(x+2)

the original problem is

(x)/(x-3)-4-(2x-5)/(x+2)

I posted something before this, so now this is how far I got.
The answer I know is -(5x^2-17x-9)/(x-3)(x+2)

first I get

(x)(x+2)/(x-3)(x+2)- (4)(x-3)(x+2)/(x-3)(x+2)-(2x-5)(x-3)/(x-3)(x+2)
Then I get

x^2+2x-4x^2-4x-24-2x^2-11x+15 (for the top)

When I put everything together I get

(-5x^2 -13x -9)/ (x-3)(x+2)

as you can see however I am having a problem with + and - because I get -13x instead of -17x so could you look at what I am doing wrong and explain it to me?



(x)(x+2)/(x-3)(x+2)- (4)(x-3)(x+2)/(x-3)(x+2)-(2x-5)(x-3)/(x-3)(x+2)
is ok for the top.

here you are looking at 3 terms, the key is to keep the brackets until you are ready for the subtraction.

You top should have looked like this

x^2+2x-(4x^2-4x-24)-(2x^2-11x+15)

which will then become
x^2+2x-4x^2+4x+24-2x^2+11x-15
=-5x^2 + 17x + 9 for the numerator

I also noticed that you had a -9 at the end in your given answer, it should have been +9 .

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