How does this simplification work?

[rishi kesh]

Please check the image below. My algebra is bit rusty. Please explain the second step where the common factor is taken out.

 

[Mark44]

$\sqrt{x^2 + x} = \sqrt{x^2 + \frac{x^2}x} = \sqrt{x^2(1 + \frac 1 x)}$
Can you work out the rest?

 

[rishi kesh]

$\sqrt{x^2 + x} = \sqrt{x^2 + \frac{x^2}x} = \sqrt{x^2(1 + \frac 1 x)}$
Can you work out the rest?

That really helped.i know how to do rest.thanks:D