Question

Encontre o valor de x considerando que log4 128 = x

Answer 1

na calculadora

log de 4 / 128 = 4,70359682x10^-3

Answer 2

$\mathrm{\log_b{a}=x\ \to\ b^x=a}\\\\ \mathrm{\log_4{128}=x\ \to\ 4^x=128}\\\\ \mathrm{(2^2)^x=2^7\ \to\ 2^{2x}=2^7}\\\\ \mathrm{2x=7\ \to\ x=\dfrac{7}{2}}$