Question

Write (1 + 2i) ^ 3 in the form of A + iB​

Answer 1

${a + b} }^3 = acube + bcube + 3ab{a + b}$

$1 + 8icube + 6i(1 + 2i)$

i3=-i, i2=-1

1-8i+6i-12

-11-2i answer