Tuesday
September 2, 2014

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 .

Answer this Question

First Name:
School Subject:
Answer:

Related Questions

Algebra - x/(x-3)-4-(2x-5)/(x+2) If the problem is this: x/(x - 3) - 4 - (3x - 5...
Math Algebra - Resolve(17x+14x + 9) (-13x +6x - 12) 30xsquared+20x+21 I'll ...
Algebra help - f(x)=x^3-4x^2-x+4 How do I find the x-intercept for this? This is...
math - I need help with this problem. If someone can do it step by step that ...
Algebra - (x)/(x-3)-4-(2x-5)/(x+2) I posted something before this, so now this ...
Algebra - (x)/(x-3)-4-(2x-5)/(x+2) I posted something before this, so now this ...
Algebra - 4x^4-18x^2=0. I have to find out what x equals by factoring. What I ...
Math / Linear Equations - I was looking on a website that teaches linear algebra...
ALGEBRA HELP - When solving the equation, what property was used to go from step...
Physics - A point (labelled P in the figure) is attached to the rim of a disk of...

Search
Members