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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