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 .