The inequality is .

Step 1:

Solve the quadratic inequality.

                                    (Related function)

                    (Subtract from each side)

      (Factor)

or     (Zero productive property)

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 )

                                 (Evaluate powers: )

                                      (Multiply)

                                                 (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 .