Practice!

Sample Problem

Decide whether the table below represents exponential growth or decay, then write a rule for it

x

y

-2

0.125

-1

0.5

0

2

1

8

2

32

Solution

We can see from the table that this is an example of exponential growth, so choice A and C are not correct.

We know that the value must be 2 because when x is 0 y is 2, so  y = 2 × 4x

Choice B Is correct.