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Posted by **Rachal** on Sunday, January 23, 2011 at 6:38am.

x-(6+2i)][x-(6-2i)]

Note that these expressions contain complex numbers.

Simplify your answer as much as possible.

- complex numbers -
**MathMate**, Sunday, January 23, 2011 at 8:41amLet a=6+2i, b=6-2i

(x-a)(x-b)

=x²-(a+b)x+ab

a+b = 12

ab=6²-(2i)²

=36-(-4)

=40

So

(x-a)(x-b)

=x²-12x+40

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