# How do you evaluate 9 + 2*squareroot(5)?

Nov 21, 2015

$9 + 2 \sqrt{5} = 13.472$

#### Explanation:

$9 + 2 \sqrt{5}$

$\sqrt{5}$ is an irrational number—it is a never-ending decimal that can't be written as a fraction. You must use a calculator to determine its value.
(It is equal to about $2.2360679774997896964091736687312762$)...

We will round it to the thousandth place.

$9 + 2 \left(2.236\right) = 9 + 4.472 = 13.472$