Posted by **Mary** on Sunday, October 12, 2008 at 4:20pm.

Find two rational expressions that have a sum of 9-9x/x^2-9

I need steps not just answers

- Math Analysis -
**Ryan**, Sunday, October 12, 2008 at 4:23pm
First, I assume you mean (9-9x)/(x^2-9)?

- Math Analysis -
**Damon**, Sunday, October 12, 2008 at 4:47pm
Making the same assumption as Ryan

9[(1-x)]/(x-3)(x+3)=9[a/(x-3)+b/(x+3)]

a(x+3) + b(x-3) = 1-x

a+b=-1

3a-3b=1

solve and get a =-1/3, b=-2/3

so

9 [(-1/3)/(x-3) -(2/3)/(x+3)]

= -3/(x-3) -6/(x+3)

- Math Analysis -
**Ryan**, Sunday, October 12, 2008 at 4:53pm
If my assumption is true, you could simply use 9/(x^2-9) + -9x/(x^2+9), as these are both rational expressions, I think.

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