Asked by Angela

Simplify the expression.
(-5i)(-3i)

a.15i
b.-15i
c.-15
d.15

11 years ago

Answered by Reiny

Of course you have to know that i^2 = -1

so (-5i)(-3i)
= 15i^2
= 15(-1)
= -15

11 years ago

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