Determine the x values that cause the function to be (a) zero, (b) undefined, (c) positive, and (d) negative.f(x) = x

A. (a) {0}, (b) (-?, 0), (c) (0, ?), (d) ?
B. (a) {-9}, (b) (-?, -9), (c) (-9, ?), (d) ?
C. (a) {-9, 0}, (b) (-?, -9), (c) (-9, 0), (d) (0, ?)
D. (a) {-9, 0}, (b) (-?, -9), (c) (0, ?), (d) (-9, 0)


Answer: D

Mathematics

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