Question: If the range of the exponential function f(x) = a(7)^x +c is the set {yeR| y <9}, which of the following values of a is

If the range of the exponential function f(x) = a(7)^x +c is the set {yeR| y<9}, which of the following values of "a" is not admissible?

A. a= -1

B. a= -2

C. a= -3

D. a= 4

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