Question

Pela definição como calculo log0,25 8?

Answer 1

$\log_{0,25}8=x\\\\0,25^x=8\\\\\left(\dfrac{1}{4}\right)^x=8\\\\\left(2^{-2}\right)^x=2^3\\\\2^{-2x}=2^3\\\\-2x=3\\\\x=-\dfrac{3}{2}\\\\x=-1,5$