Question

 ME AJUDEM ,,,simplifique as seguintes expressoes
a)  x² -3x -4 , COM X $\neq$ -1
       3X+3 
b)  x² - 7x , com x$\neq$ -10e x$\neq$ 7
    x²+3x-70

Answer 1

a)
$\frac{ x^{2} -3x-4}{3x+3}= \frac{(x-4)(x+1)}{3(x+1)} = \frac{x-4}{3}$

Cancela (x+1)

b)

$\frac{ x^{2} -7x}{ x^{2} +3x-70} = \frac{x(x-7)}{(x-7)(x+10)} = \frac{x}{x+10}$

cancela (x-7)