The inequality is .

Step 1:

Solve the quadratic equation .

                                (Related function)

                              (Add to each side)

                            (Quadratic formula)

     (Substitute and )

                                    (Simplify)

or            (Write into two equations)

or                         (Simplify)

Step 2:

Plot and on a number line.

Observe the graph:

The number line divide into three intervals.

Step 3: Test a value from each interval of the original inequality.

Case(i):

                                 (Original function)

                      (Substitute )

                        (Evaluate powers: )

                                    (Multiply)

                                               (Simplify)

Case(ii):

                                (Original function)

                            (Substitute )

                                                  (Simplify)

Case(iii):

                                 (Original function)

                             (Substitute )

                              (Evaluate powers: )

                                      (Multiply)

                                              (Simplify)

Hence, the solution set is .

It is shown on the number line.

Solution set is .