The inequality is .

Step 1:

Solve the quadratic equation .

                                       (Related function)

                                       (Subtract from 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 .