Simplifying Radicals -- subtraction under radicals

[jtw2e2]

Hi, would someone help me simplify this?

2/(?(-4x[sup:1y9s66pa]2[/sup:1y9s66pa]-4x)

How can I pull out (or take the square root of) the 4's?

 

[jtw2e2]

Hi, would someone help me simplify this?

2/(?(-4x[sup:m8czlwrk]2[/sup:m8czlwrk]-4x)

How can I pull out (or take the square root of) the 4's?

Nevermind, I figured it out. You have to factor out a positive 4...