# How do you simplify (-7sqrt3)(-4sqrt10)?

$28 \cdot \sqrt{3} \cdot \sqrt{10}$
$\left(- 7 \sqrt{3}\right) \left(- 4 \sqrt{10}\right)$
$\therefore = - 7 \sqrt{3} \times - 4 \sqrt{10}$
$\therefore = 28 \cdot \sqrt{3} \cdot \sqrt{10}$