If -1 is a root of f(x), which of the following must be true A. a factor of f(x) is (x-1)
B. a factor of f(x) is (x+1)
C. both (x-1) and (x+1) are factors of f(x)
D. neither (x-1) nor (x+1) is a factor of f(x)

B

Step-by-step explanation:

It is not certain which type of function f(x) is but what we do know is that if something is a root, then it is where the function will cross the x axis or where f(x) = 0.

If -1 is a root of f(x), f(-1) = 0.

If a factor of f(x) is (x+1), f(-1) = (-1 + 1) = 0.

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step-by-step explanation: