simplify.\n$sqrt{45}$

Explanation:

Step1: Factorize 45

$45 = 9\times5$

Step2: Apply square - root property

$\sqrt{45}=\sqrt{9\times5}=\sqrt{9}\times\sqrt{5}$

Step3: Calculate $\sqrt{9}$

Since $\sqrt{9} = 3$, then $\sqrt{9}\times\sqrt{5}=3\sqrt{5}$

Answer:

$3\sqrt{5}$