# How do you solve sqrt(x-1) = 7?

Jan 22, 2017

$x = 50$

#### Explanation:

Square to undo a square root.

$\sqrt{x - 1} = 7$

${\left(\sqrt{x - 1}\right)}^{2} = {7}^{2}$

The square root is no longer a factor:

$x - 1 = 49$

$x = 50$