The equation is .

         (Subtract 11 from each side.)

            (Add 100 to each side)

                      (Add: )

The perfect square of the given trinomial .

                      (Take the square root of each side)

Apply square roots property: If then .

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

                   (Subtract 10 from each side)

                                    (Apply additive inverse property: )

Separate the solutions .

The solution set is .