Question

(1+2i)^-3 find the form of a+ib (simplify)​

Answer 1

Answer:

= -11-2i

Step-by-step explanation:

$= (1+2i^3) = (1) ^3 + 3(1)^2(2i) {}^{2}+(2i) {}^{3} \\ =1 + 6i - 12 - 8i \\ = -11 - 2i$