Answer:
x³ - 2x² - 84x + 360
Explanation:
(f • g)(x) = f(x) × g(x), that is
(x² + 4x - 60)(x - 6)
Each term in the second factor is multiplied by each term in the first factor, that is
x²(x - 6) + 4x(x - 6) - 60(x - 6) ← distribute parenthesis
= x³ - 6x² + 4x² - 24x - 60x + 360 ← collect like terms
= x³ - 2x² - 84x + 360