Question

What polynomial has roots of -4, 2, and 5 ? (3 points)
A) x3 - x2 - 22x + 40
B) x3 + x2 - 22x - 40
C) x3 + 3x2 - 18x - 40
D) x3 - 3x2 - 18x + 40

Answer 1

Recall that if "a" is a root of a function, then it must have (x-a) as a factor. So, since we have the roots -4, 2, and 5, we can find the function by multiplying each of these factors:
(x-2)(x-5)(x+4)
Once you multiply these out you'll have your answer.