Applicare la formula: $\frac{d}{dx}\left(ab\right)$$=\frac{d}{dx}\left(a\right)b+a\frac{d}{dx}\left(b\right)$, dove $d/dx=\frac{d}{dx}$, $ab=x^7e^x$, $a=x^7$, $b=e^x$ e $d/dx?ab=\frac{d}{dx}\left(x^7e^x\right)$

Applicare la formula: $\frac{d}{dx}\left(x^a\right)$$=ax^{\left(a-1\right)}$, dove $a=7$

Applicare la formula: $a+b$$=a+b$, dove $a=7$, $b=-1$ e $a+b=7-1$

Applicare la formula: $\frac{d}{dx}\left(e^x\right)$$=e^x$