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 .