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Basically, in an exponential expression (or equation) you have the independent variable in the exponent. For example:

5 times 10x

The general form of an exponential function can be written as:

abx

or:

aekx

where a, b, and k are constants, and e is approximately 2.718. Note that just having a power doesn't mean you have an exponential equation. For example, in

x3

the variable does NOT appear in the exponent, so it is not an exponential expression.

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