Question

(1/3)^2x-2=81 resolver a equação

Answer 1

Resposta:

${ \frac{1}{3} }^{2x - 2} = 81 \\ { ({3}^{ - 1} )}^{2x - 2} = {3}^{4} \\ {3}^{ - 2x + 2} = {3}^{4} \\ - 2x + 2 = 4 \\ - 2x = 4 - 2 \\ - 2x = 2 \\ - x = \frac{2}{2} \\ x = - 1$