Posted by Rachal on .
Multiply.
x(6+2i)][x(62i)]
Note that these expressions contain complex numbers.
Simplify your answer as much as possible.

complex numbers 
MathMate,
Let a=6+2i, b=62i
(xa)(xb)
=x²(a+b)x+ab
a+b = 12
ab=6²(2i)²
=36(4)
=40
So
(xa)(xb)
=x²12x+40