(7+2i)(2+3i) what is this answer

asked Jan 15, 2015 184k views

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3 votes

Use FOIL
First
Outter
Inner
Last
(7*2)+(7*3i)+(2i*2)+(2i*3i)
=14+21i+4i+6i
=14+31i
So your answer would be 14+31i

Smur answered Jan 18, 2015

by Smur

6.5k points

3 votes

this turns into

14+4i+21i+6i^2
14+25i+6(-1)
14+25i-6
8+25i is the answer

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