Question

como resolve: (1/4) *x = V128

Answer 1

$(\frac{1}{4}) ^{x}= \sqrt{128}$

$(4) ^{-x}= \sqrt{ 2^{7} }$

$( 2^{2}) ^{-x}= \sqrt{ 2^{7} }$

$2^{-2x}= \sqrt{ 2^{7} }$

$( 2^{-2x})^2=( \sqrt{ 2^{7} })^2$

$2^{-4x}= 2^{7}$ ----bases iguais,iguala os expoentes

$-4x=7-->4x=-7-->x=- \frac{7}{4}$