Question

what is $sqrt{324}$?

Explanation:

Step1: Recall square - root concept

We need to find a number $x$ such that $x\times x = 324$.

Step2: Factorize 324

$324=2\times162 = 2\times2\times81=2^2\times9^2=(2\times9)^2 = 18^2$.

Answer:

18