The equation is .

                                     (Square each side and eliminate the square roots)

     (Subtract   from each side) \ \

Combine like terms using distributive property: ab - ac = a( b - c).

                             (Apply zero product property)

                                   (Simplify)  

Check:

To check the solution substitute  in .

                                                        (Evaluate square roots: )

The solution is "True".

Check:

To check the solution substitute  in .

                                                    (Evaluate square roots: )

The solution is "false".

The solution is 3.