Applicare la formula: $\log_{b}\left(mn\right)$$=\log_{b}\left(m\right)+\log_{b}\left(n\right)$, dove $mn=x^3y^9z$, $b=c$, $b,mn=c,x^3y^9z$, $m=x^3$ e $n=y^9z$

Applicare la formula: $\log_{b}\left(mn\right)$$=\log_{b}\left(m\right)+\log_{b}\left(n\right)$, dove $mn=y^9z$, $b=c$, $b,mn=c,y^9z$, $m=y^9$ e $n=z$

Applicare la formula: $\log_{b}\left(x^a\right)$$=a\log_{b}\left(x\right)$, dove $a=3$ e $b=c$

Applicare la formula: $\log_{b}\left(x^a\right)$$=a\log_{b}\left(x\right)$, dove $a=9$, $b=c$ e $x=y$