Question

-7x + 7=0 e -2x-2=0 ( some as raízes)

Answer 1

Explicação passo-a-passo:

$- 7x + 7 = 0 \\ - 7x = 0 - 7 \\ - 7x = - 7 \\ x = \frac{ - 7}{ - 7} \\ x = 1 \\ - 2x - 2 = 0 \\ - 2x = 0 + 2 \\ - 2x = 2 \\ x = \frac{2}{ - 2} \\ x = - 1 \\ 1 + ( - 1) = 1 - 1 = 0$