# How to Differentiate Negative Exponentials ••• ChristianChan/iStock/GettyImages
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Differentiation is one of the key components of calculus. Differentiation is a mathematical process for discovering how a mathematical function changes at a particular instant in time. This process can be applied to many different types of functions, including the exponential function (y = e^x, in mathematical terms), which has a particularly important place in calculus, as the function remains the same when differentiated. Negative exponentials (that is, an exponential taken to a negative power) are a special case of this process, but are relatively straightforward to calculate.

Write down the function you will be differentiating. As an example, assume the function is e to the negative x, or y = e^(-x).

Differentiate the equation. This question is an example of the chain rule in calculus, where one function is located within another function; in mathematical notation, this is written as f(g(x)), where g(x) is a function within the function f. The chain rule is written as

y' = f'(g(x)) * g'(x),

where the ' indicates differentiation and * indicates multiplication. Therefore, differentiate the function in the exponent and multiply this by the original exponent. In equation form, this is written as y = e^[f(x)]*f'(x)

Applying this to the function y = e(-x) gives the equation y' = e^x *(-1), since the derivative of -x is -1 and the derivative of e^x is e^x.

Simplify the differentiated function:

y = e^(-x) * (-1) gives y = -e^(-x).

Therefore, this is the derivative of the negative exponential.

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