Question 131966
Simplify:
{{{(5-4i)^2}}} Use the FOIL method to multiply.
{{{(5-4i)(5-4i) = 25-20i-20i+16i^2}}} Combine like-terms.
{{{25-40i+16i^2}}} Replace {{{i^2}}} with its equivalent, -1
{{{25-40i+16(-1)}}} Simplify.
{{{25-40i-16 = 9-40i}}}