# How do you simplify sqrt5/(5+sqrt2)?

To simplify, we have to multiply by the conjugate of the denominator, or $5 - \sqrt{2}$.
$\frac{\sqrt{5}}{5 + \sqrt{2}} \setminus \cdot \frac{5 - \sqrt{2}}{5 - \sqrt{2}} = \frac{5 \sqrt{5} - \sqrt{10}}{25 - 2} = \frac{5 \sqrt{5} - \sqrt{10}}{23}$