Answer:
P(7) = 0
P(-1) = 0
P(-4) = 0
Step-by-step explanation:
P(x) = x³ - 2x² - 31x - 28
P(7) = 7³ - 2(7)² - 31(7) - 28 = 0
P(-1) = (-1)³ - 2(-1)² - 31(-1) - 28 = 0
P(-4) = (-4)³ - 2(-4)² - 31(-4) - 28 = 0
