How do I manipulate to the desired form?

[shreddinglicks]

I want to manipulate the first equation into the form below it.

 

[lev888]

Move u to the right side, square both sides.

 

[Steven G]

So you want to manipulate the first equation into the form below it. OK. So what have you tried? Seems like a nice problem. I would start with the hint above. Try the hint and see how far you can get. Show us your work so we can see where you went wrong in case you do have an error.

 

[shreddinglicks]

I figured it out based on what lev888 said to do. Simple but I didn't see it. Thanks for the help.