# I need to "Epxplain whether each function is expontential" for the following numbers: f(x)=4x(to the 9th power) How do you find it?

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Function `f(x)=4x^9` is not exponential function. It is a polynomial of ninth degree.

For function to be *exponential* the variable (`x`) must be in *exponent*.

Examples of exponential functions are:

`g(x)=e^x`

`h(x)=2^x+5`

`l(x)=10^(3x-7)`