Practice!

Sample Problem

Is the following table of values an example of exponential decay?

x

y

-2

20

-1

10

0

5

1

2.5

2

1.25

Solution

The exponetial fuctions are of the form  y = a × bx,

When a > 0 and 0 < b < 1

Each time x is increased by 1, y decreases by a multiple of any number.

This table is an example of exponential decay because as the x value increases by 1, the y value decreases to one half of its previous value.