Answer:

x³ - 4x² + 4x + 16

Solutions:

Given: -2, 2, 4

(x + 2)(x - 2)(x - 4)

Multiply first (x + 2) and (x - 2).

x + 2

x - 2

-2x - 4

x² + 2x

x² - 4

Multiply the product with (x - 4).

x² - 4

x - 4

- 4x² + 16

x³ - 4x

x³ - 4x² + 4x + 16