Introductory Algebra for College Students (7th Edition)

$\frac{\sqrt5}{10}$
$\frac{1}{\sqrt{20}}$ Simplify by factoring out perfect squares. $\frac{1}{\sqrt{(4)(5)}}$ Simplify. $\frac{1}{2\sqrt5}$ Rationalize the denominator. $\frac{1}{2\sqrt5}\times\frac{\sqrt5}{\sqrt5}$ Use product rule for square roots. $\frac{\sqrt{5}}{10}$