# How do you evaluate sqrt(16-x) when x = 8?

Mar 10, 2018

$2 \sqrt{2}$

#### Explanation:

First substitute 8 for x in the equation
sqrt(16-8
Then simplify to get
$\sqrt{8}$
This can be broken down into surd form to get
$\sqrt{4.} \sqrt{2}$
The square root of 4 is 2, but the square root of 2 is irrational, so can be left in surd form.
This leaves
$2 \sqrt{2}$