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Question: Which of the following functions is not an exponential function?


A ) y = 4x
B ) y = (17)x
C ) y = 5- x
D ) y = (- 65)x

Steps to derive

1 A function of the type y = abx, where b > 0 is an exponential function

2 The function y = 4x is in the form of y = abx where a = 1, b = 4 > 0.

3 So, it is an exponential function.

4 The function y = (17)x is in the form of y = abx where a = 1, b = 17 > 0.

5 So, it is an exponential function.

6 The function y = (5 )- x = (15)x is in the form of y = abx where a = 1, b = 15 > 0.

7 So, it is an exponential function.

8 The function y = (- 65)x is not an exponential function since a = 1, b = - 65 < 0.



Hence the right answer is Option D

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