Applicare la formula: $\left(a+b\right)^3$$=a^3+3a^2b+3ab^2+b^3$, dove $a=4^f$, $b=-3a$ e $a+b=4^f-3a$

Applicare la formula: $ab$$=ab$, dove $ab=3\cdot -3\left(4^f\right)^2a$, $a=3$ e $b=-3$

Applicare la formula: $\left(x^a\right)^b$$=x^{ab}$, dove $a=f$, $b=3$, $x^a^b=\left(4^f\right)^3$, $x=4$ e $x^a=4^f$

Applicare la formula: $\left(x^a\right)^b$$=x^{ab}$, dove $a=f$, $b=2$, $x^a^b=\left(4^f\right)^2$, $x=4$ e $x^a=4^f$