Question

O valor de “a” que torna a equação 8a + 55 = - 17 , verdadeira é:

a) 3
b) 9
c) -3
d) -9​

Answer 1

Resposta:

$8a+55=-17\\\\8a+55-55=-17-55\\\\8a=-72\\\\\frac{8a}{8}=\frac{-72}{8}\\\\\frac{8a}{8}\\\\\mathrm{Dividir:}\:\frac{8}{8}=1\\\\=a\\\\\frac{-72}{8}\\\\\mathrm{Dividir:}\:\frac{72}{8}=9\\\\=-9\\\\a=-9$