# How do you simplify (-7 square root of 3)(-4 square root of 10)?

Sep 15, 2015

$28 \sqrt{30}$

#### Explanation:

$\left(- 7 \sqrt{3}\right) \left(- 4 \sqrt{10}\right)$

$- 7 \sqrt{3} \times - 4 \sqrt{10}$

Negative times a negative equals a positive.

$7 \sqrt{3} \times 4 \sqrt{10}$

Simplify.

$7 \times 4 \sqrt{3 \times 10}$

Simplify.

$28 \sqrt{30}$