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Identifying Exponential Functions
Which of the following is an exponential function?
A
f(
x
) = 4
x
* 2
x
B
f(
x
) = 5 /
x
C
f(
x
) =
x
3
+ 2
x
2
- 6
D
f(
x
) = 5
x
+ 2
E
f(
x
) = 4
x
2
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