Asked by devon
simplify (1+3i)(1-5i)
Answers
Answered by
MathMate
Multiply 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
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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