My good sir Mr. Guest I believe I can help you with this situation.
You are given:
\(\sqrt{200}+\sqrt{18}\)
You have to find muliples of 200 and 18, separate them and try to find perfect squares like so:
\(\sqrt{4* 2 * 25} + \sqrt{9 * 2}\)
4, 25, and 9 can go on the outside of the square root giving you:
\(2*5\sqrt{2} + 3\sqrt{2}\)
I'm sure you can simplify.