Natural Exponential Function: y = e^x

in MES Science6 years ago (edited)

In this video I go over the natural exponential function y = ex and define it strictly from looking at the inverse of the natural logarithmic function y = ln(x). The natural exponential function is one of the most widely used and important function in all of mathematics so it is important to understand the definition of it.


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The Natural Exponential Function y = ex

Natural Exponential ex.jpeg

The natural exponential function y = ex derived from the natural logarithm function y = ln(x)

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ln(x) is an increasing function thus it is a one-to-one function (i.e. each y-value has only 1 x-value)

Thus it has an inverse function (i.e. can switch or “invert” all data points from (x, y) to (y, x).

Let exp be the inverse of y = ln(x), in other words:

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Recall the cancellation formulas:

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Recall also the log law: If r is a rational number:

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Taking into account all the above requirements for the inverse of ln(x), it leads us to define (even if x is irrational).

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The natural exponential function, ex, is very important because it is used throughout calculus, engineering, etc.
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