The equation is . \ \ (Square each side and eliminate the square roots)

\ \

Apply formula: .

\ \

  (Subtract from each side) \ \

( divide into factors )

\ \

\ \

                                        (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 "True".

The solutions are 3, 4.