The qudractic expression is .

                     (Add 4 to each side)

                           (Add: )

The perfect square of the given trinomial .

Apply square roots property: If , then .

Apply addition property of equality: If a = b then a + c = b + c.

                 (Add 2 to each side)

                             (Apply additive inverse property: )

Using the calculator and evaluate square roots.

Separate the solutions .

The solution set is .