# How do you simplify 4(-2i)(-2i)?

Aug 8, 2018

$- 16$

#### Explanation:

$4 \left(- 2 i\right) \left(- 2 i\right)$

Multiply:
$= - 8 i \left(- 2 i\right)$

$= 16 {i}^{2}$

We know that ${i}^{2}$ equals to $- 1$, so:
$= 16 \left(- 1\right)$

$= - 16$

Hope this helps!