# How do you evaluate squareroot(5) - squareroot(2)?

$\sqrt{5} - \sqrt{2} = 0.821854415127$.
$\sqrt{5} - \sqrt{2}$ cannot be simplified further, as both $5$ and $2$ are prime numbers.
However, you could use a calculator, in which case $\sqrt{5} - \sqrt{2} = 0.821854415127$.