The qudractic expression is .

                     (Add 49 to each side)

                                 (Add: )

The perfect square of the given trinomial .

Apply square roots property: If , then .

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

                           (Subtract 7 from each side)

                                       (Apply additive inverse property: )

Using the calculator and evaluate square roots.

Separate the solutions .

The solution set is .