Question

Am nevoie de ajutor la subpuctul c. Mulțumesc

Answer 1

$\it f(\dfrac{1}{125})=-3 \Rightarrow log_5\frac{1}{125}=-3 \Rightarrow log_55^{-3}=-3 \Rightarrow-3log_a5=-3|_{:(-3)}\Rightarrow\\ \\ \\ \Rightarrow log_a5=1 \Rightarrow a=5$