Secondly, you should show that you've attempted to solve the problem. We're not suppose to just give answers, since people will obviously abuse the forum. However, it's understandable if you don't know how to get started on a problem.
When you need to solve a radical equation, isolate one of the radicals and square.
Now isolate the other radical and square again. Then solve for . See if you can figure out how to do that. If you can't, just repsond with your attempt and we will help.