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January 30, 2015

January 30, 2015

Posted by **devon** on Wednesday, May 16, 2012 at 10:47pm.

- math -
**MathMate**, Wednesday, May 16, 2012 at 10:59pmMultiply them out using the FOIL rule.

When you get i², replace by -1.

Using FOIL:

F=1

O=-5i

I=3i

L=-15i²=15

Sum like terms:

(1+3i)(1-5i) = 16-2i

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