# Math Help - Square root inside square root equation

2. ## Re: Square root inside square root equation

Originally Posted by Remriel
Square both sides.
Subtract x
Square both sides (don't forget to "FOIL"/distribute)
Subtract 5
Check for extraneous roots

3. ## Re: Square root inside square root equation

Originally Posted by Remriel
If $\sqrt{\sqrt{x+5}+x~}=5$ then $\sqrt{x+5}=25-x$.
Now you finish it off.

4. ## Re: Square root inside square root equation

Oh wow, I was making a really stupid mistake on this easy problem. Thanks.