We are given:
To remove the radical, square both sides:
Now multiply through by :
Arrange with terms involving on the left, and the rest on the right:
Factor the left side:
Can you proceed from here?
Hmmm, im sorry you'll have to excuse my lack of knowledge. I haven't had math courses of any kind for several years. What is the final step you did factoring the left side. How did you completely get rid of one x^2