Question

what number is equal to $sqrt{64}$?

Explanation:

Step1: Recall square - root definition

The square - root of a number $x$, denoted as $\sqrt{x}$, is a value $y$ such that $y\times y=x$. We need to find a number $y$ where $y^2 = 64$.

Step2: Find the number

We know that $8\times8 = 64$ and $(- 8)\times(-8)=64$. In the case of the principal square - root (denoted by $\sqrt{}$ without a $\pm$ sign in front), $\sqrt{64}=8$.

Answer:

8