SOLUTION: (2+i)(3-i)(2-3i) i=imaginary unit I know we're supposed to do FOIL, but in what order?

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Question 353044: (2+i)(3-i)(2-3i)
i=imaginary unit
I know we're supposed to do FOIL, but in what order?
Found 2 solutions by solver91311, robertb:
Answer by solver91311(24713) About Me  (Show Source):
You can put this solution on YOUR website!


It doesn't matter. Multiplication is just as commutative over as it is over .

John

My calculator said it, I believe it, that settles it
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Answer by robertb(5830) About Me  (Show Source):
You can put this solution on YOUR website!
You can do it in any order--Multiplication of complex numbers is commutative.
%282%2Bi%29%283-i%29%282-3i%29
=%286-2i%2B3i-%28-1%29%29%2A%282-3i%29
=%287%2Bi%29%2A%282-3i%29
=14%2B2i-21i-3i%5E2
=14-19i-3%28-1%29
=17-19i