x.^{2}-x-123+x

x^{2}-9 4-x

ans(x-4)(3+X)(X-3)(4-X)

THERE IN THE BOOK IS(3+X)

(X-3)(Wondering)

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- Jun 10th 2012, 06:46 AMzbest1966raftional expression?
__x__.^{2}-x-12__3+x__

x^{2}-9 4-x

ans__(x-4)(3+X)__(X-3)(4-X)

THERE IN THE BOOK IS__(3+X)__

(X-3)(Wondering) - Jun 10th 2012, 06:57 AMReckonerRe: raftional expression?
- Jun 10th 2012, 06:59 AMProve ItRe: raftional expression?
$\displaystyle \displaystyle \begin{align*} \frac{x^2 - x - 12}{x^2 - 9} \cdot \frac{3 + x}{4 - x} &= \frac{(x - 4)(x + 3)}{(x - 3)(x + 3)}\cdot \frac{3 + x}{4 - x} \\ &= \frac{-(4 - x)(x + 3)(3 + x)}{(x - 3)(x + 3)(4 - x)} \\ &= \frac{-(3+x)}{x - 3} \end{align*}$

Both your answer and the book's answer are wrong. - Jun 10th 2012, 07:00 AMPlatoRe: raftional expression?
- Jun 10th 2012, 07:01 AMzbest1966Re: raftional expression?
if you a negative on the top you must put a negative on the bottom.

- Jun 10th 2012, 07:20 AMProve ItRe: raftional expression?