Which answer is equal to -2i*(-2i)? A) 4 B) -4 C) 4i D) -4i

asked Mar 17, 2019 122k views

1 vote

Which answer is equal to -2i*(-2i)?

A) 4

B) -4

C) 4i

D) -4i

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4 votes

$\bf \textit{recall that }i^2=-1\qquad therefore \\\\\\ -2i(-2i)\implies +2^2i^2\implies 4(-1)\implies -4$

Rahul Vig answered Mar 20, 2019

6.0k points

2 votes

I got letter B which is -4

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