# How do you simplify sqrt5 times sqrt5?

$\sqrt{5} \times \sqrt{5} = 5$
By definition, $\sqrt{x}$ is a value whose square is $x$, that is, $\sqrt{x} \times \sqrt{x} = x$ for any $x$.
If $x \ge 0$, then $\sqrt{x}$ denotes the unique non negative value with that property.