Is the function f (x) = (-13) x an exponential function? If so, identify the base. If not, why not?

A.

Yes, base = 13.

B.

Yes, base = - 13

C.

No, there is no constant raised to a variable x.

D.

No, the constant raised to a variable exponent is negative.

How do I do this question f (x) = -x^2+5

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