Question 935839

{{{(5-2i)(5 + 2i)}}}

{{{5*5 + 5*2i-2i*5-2i(2i)}}}

{{{25 + 10i-10i-4i^2}}}....recall that {{{i^2=-1}}}

{{{25 + cross(10i)-cross(10i)-4(-1)}}}

{{{25 +4}}}

{{{29}}}