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 is divided 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 .