Question 1083283

{{{(2+i)^7}}}

={{{(2+i)(2+i)(2+i)(2+i)(2+i)(2+i)(2+i)}}}

={{{(3 + 4i)(3 + 4i)(3 + 4i)(2+i)}}}

={{{(-7 + 24i)(3 + 4i)(2+i)}}}

={{{(-117 + 44i)(2+i)}}}

={{{-278 - 29i}}}