Question

Simplifique as expressões:
$a) \frac{x^{3}+x^{2}-9x-9 }{x^{2}+6x+9} \\\\ b) \frac{5.(x-2)^{2}-5.(x+2)^{2}}x$

Answer 1

Vamos lá!
$a=\frac{(x-3)(x+1)(x+3)}{(x+3)^{2}} \\ \\ Simplficando \\ \\ a=\frac{(x-3)(x+1)}{(x+3)}} \\ \\ \\ b= \frac{-40x}{x} \\ \\ b= -40$