Question

z=(2-i)^3(2+11i) помогите

Answer 1

$z=(2-i)^3(2+11i)=(2-i)^2\cdot (2-i)(2+11i)=(4-4i+i^2)\cdot \\ \\ \cdot (4-11i^2-2i+22i)=(-4i+4-1)\cdot (4+11+20i)=\\ \\ =(3-4i)(15+20i)=5(3-4i)(3+4i)=5(9+16)=125$

Ответ: 125