Question

(4a-b)²=?
(4a-b)³?
(4a+b)³?

Answer 1

(4a-b)²=(4a)²-2*4a*b+b²=16a²-8ab+b²
(4a-b)³=(4a)³-3*(4a)²*b+3*4a*b²-b³=64a³-48a²b+12ab²-b³
(4a+b)³=(4a)³+3*(4a)²*b+3*4a*b²+b³=64a³+48a²b+12ab²+b³