The inequality is .

Step 1: Solve the quadratic inequality.

                      (Related function)

                   (Add to each side)

                    (Factor)

or              (Zero productive property)

or                          (Simplify)

Step 2: Plot on a number line.

Observe the graph:

The number line divide into one two interval.

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)

Hence, the Solution set is .

It is shown on the number line.

Solution set is .