SOLUTION: Help please! I have to simplify each expression: (1 + 2i) (6-3i) thank you

Algebra ->  Rational-functions -> SOLUTION: Help please! I have to simplify each expression: (1 + 2i) (6-3i) thank you      Log On


   

Question 527654: Help please!
I have to simplify each expression:
(1 + 2i) (6-3i)

thank you
Answer by htmentor(1343) About Me  (Show Source):
You can put this solution on YOUR website!
(1+2i)(6-3i)
Use FOIL:
6 - 3i + 12i - 6i^2
Collect terms, and use the fact that i^2 = -1:
6 + 9i - -6 -> 12 + 9i