Answer:
x = 0, x = ± 3
Step-by-step explanation:
To find the roots equate the polynomial to zero, that is solve
x³ - 9x = 0 ← factor out x from both terms
x(x² - 9) = 0 ← factor difference of squares
x(x - 3)(x + 3) = 0
equate each factor to zero and solve for x
x = 0
x - 3 = 0 ⇒ x = 3
x + 3 = 0 ⇒ x = - 3
roots are x = 0, x = ± 3
