# Math Help - Multiplying complex numbers

1. ## Multiplying complex numbers

Write the complex number in the form a + bi.

[1 + sq rt (-2)] * [2 + sq rt (-4)]

2 + 2*sq rt(2) + [2 + 2*sq rt(2)]i

The answer in the book is:

[2 - 2*sq rt(2)] + [2 + 2*sq rt(2)]i

I'm sorry if my typing is confusing. I don't know how to type the math symbols.
Thanks for any help.

2. $(1+\sqrt2i)(2+2i)=2+2\sqrt2i+2i-2\sqrt2=(2-2\sqrt2)+(2\sqrt2+2)i$