Determine the x values that cause the polynomial function to be (a) zero, (b) positive, and (c) negative.f(x) = (x + 4)(x + 1)(x - 2)
A. (a) {4, 1, -2}, (b) (-4, -1) ? (2, ?), (c) (-?, -4) ? (-1, 2)
B. (a) {-4, -1, 2}, (b) (-4, 2), (c) (-?, -4) ? (2, ?)
C. (a) {-4, -1, 2}, (b) (-?, -4) ? 
, (c) (-4, -1) ? (2, ?)
D. (a) {-4, -1, 2}, (b) (-4, -1) ? (2, ?), (c) (-?, -4) ? (-1, 2)
Answer: D
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