Applicare la formula: $\log_{b}\left(\frac{x}{y}\right)$$=\log_{b}\left(x\right)-\log_{b}\left(y\right)$, dove $b=10$, $x=x\left(x+4\right)$ e $y=\left(x+3\right)^{15}$

Applicare la formula: $\log_{b}\left(mn\right)$$=\log_{b}\left(m\right)+\log_{b}\left(n\right)$, dove $mn=x\left(x+4\right)$, $b=10$, $b,mn=10,x\left(x+4\right)$, $m=x$ e $n=x+4$

Applicare la formula: $\log_{b}\left(x^a\right)$$=a\log_{b}\left(x\right)$, dove $a=15$, $b=10$ e $x=x+3$