# Exponential Decay

In this video, we are going to look at exponential decay.

$y=a \times (b)^x$
For a graph to demonstrate exponential decay, the base of the exponent, b, must be between 0 and 1. These graphs decrease by a factor, and will not fall into the negatives.
For example:
The graph of
$y=200 \times (\frac{1}{2})^x$
curves slowly downward after plotting points as shown in the video, and demonstrates exponential decay. This graph decreases by a factor of $\frac{1}{2}$.

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