Question

Sabendo que 2^3x + 8 = 256 determine o valor de 2–x :
A- 4
B- 2
C- 1
D-
E-

Answer 1

$> resolucao \\ \\2 {}^{3x + 8} = 256 \\ 2 {}^{3x + 8} = 2 {}^{8} \\ 3x + 8 = 8 \\ 3x = 8 - 8 \\ 3x = 0 \\ x = \frac{0}{3} \\ x = 0 \\ \\ \\ = 2 - x \\ = 2 - 0 \\ = 2 \\ \\ \\ resposta > b \\ \\ \\ > > > > > >$