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: )

                                           (Simplify)

Hence, the Solution set is .

It is shown on the number line.

Solution set is .