Inequalities that involve more than two factors, such as (3x - 4)(x + 2)(x + 6) ≤ 0, can be solved using an extension of the method shown in to see how the method is extended.

Plot the three solutions in Exercise 87 on a number line, using closed circles because of the non strict inequality, ≤.

Exercise 87

Use the zero-factor property to solve (3x - 4)(x + 2)(x + 6) = 0.