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

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

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