SOLUTION: (5-i)(9+6i)

Algebra.Com
Question 847807: (5-i)(9+6i)
Answer by Edwin McCravy(20056)   (Show Source): You can put this solution on YOUR website!
(5-i)(9+6i)

Just FOIL it out, collect like terms, 
then substitute -1 for iČ
and collect terms again.

FOIL it out:

45 + 30i - 9i - 6iČ

Combine the middle two terms

45 + 21i - 6iČ

Substitute -1 for iČ.

45 + 21i - 6(-1)

45 + 21i + 6

Combine like terms:

51 + 21i

Edwin
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