The equation is .

                                        (Square each side and eliminate the square roots)

   (Subtract   from each side) \ \

Combine like terms using distributive property: .

                                  (Apply zero product property)

                                     (Simplify)  

Check:

To check the solution substitute  in .

                                                      (Evaluate square roots: )

The solution is "false".

Check:

To check the solution substitute  in .

                                                              (Evaluate square roots: )

The solution is "True".

The solution is zero.