Question

( a - 4b )= obs: ao cubo

Answer 1

$(a - 4b)^{3}$ = $a^{3}$ - 3$a^{2}$.4b + 3a.16 $b^{2}$ -$(4b)^{3}$ =  $a^{3}$  - 12$a^{2}$b + 48a$b^{2}$ - 64$b^{3}$