Question

dada a funçao f(x)=-2x-53 encontre o valor de x sendo f(x)=43

Answer 1

Cálculo:
$- 2x - 53 = 43 \\ - 2x = 43 + 53 \\ - 2x = 96 \\ -x = \frac{96}{2} \\ - x = 48 \\ x = -48$

Verificando:
$f(x)=-2x-53 \\ f(x)=-2.(-48)-53 \\ f(x)=96-53 \\ f(x)=43$