Asked by Angela
Simplify the expression.
(-5i)(-3i)
a.15i
b.-15i
c.-15
d.15
(-5i)(-3i)
a.15i
b.-15i
c.-15
d.15
Answers
Answered by
Reiny
Of course you have to know that i^2 = -1
so (-5i)(-3i)
= 15i^2
= 15(-1)
= -15
so (-5i)(-3i)
= 15i^2
= 15(-1)
= -15
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