Applicare la formula: $\log_{b}\left(mn\right)$$=\log_{b}\left(m\right)+\log_{b}\left(n\right)$, dove $mn=xy^2$, $b=10$, $b,mn=10,xy^2$, $m=x$ e $n=y^2$

Applicare la formula: $\log_{b}\left(x^a\right)$$=a\log_{b}\left(x\right)$, dove $a=2$, $b=10$ e $x=y$