Question

Ao último a equacao (2/5) 3x=25/4 é marque corretamente:

Answer 1

$\Large\boxed{\begin{array}{l}\sf\bigg(\dfrac{2}{5}\bigg)^{3x}=\dfrac{25}{4}\\\\\sf\bigg(\dfrac{2}{5}\bigg)^{3x}=\bigg(\dfrac{2}{5}\bigg)^{-2}\\\sf 3x=-2\\\sf x=-\dfrac{2}{3}\\\huge\boxed{\boxed{\boxed{\boxed{\sf\maltese~alternativa~a}}}}\end{array}}$