Write in Standard Form square root of 9y

$\sqrt{9 y}$

To write a polynomial in standard form, simplify and then arrange the terms in descending order.

$a x^{2} + b x + c$

Rewrite $9$ as $3^{2}$ .

$\sqrt{3^{2} y}$

Pull terms out from under the radical.

$3 \sqrt{y}$