Finite Math Examples

$- \sqrt{81 y^{2}}$

Step 1

Rewrite $81 y^{2}$ as ${(9 y)}^{2}$ .

$- \sqrt{{(9 y)}^{2}}$

Step 2

Pull terms out from under the radical, assuming positive real numbers.

$- (9 y)$

Step 3

Multiply $9$ by $- 1$ .

$- 9 y$