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Exponential Decay Functions

- 4.2 (M3)
- p. 135

Warm-Up

Evaluate the expression without using a

calculator.

3. 4 1

4. A savings account pays 3 interest compounded

monthly. What is the growth factor for this

account?

Vocabulary

- Exponential Decay y abx, where agt0 and 0ltblt1.
- b is the decay factor
- Half-life time required for a substance to half

its original value - Real Life Model y a(1-r)t where a is the

initial amount, r is the decrease as a decimal,

and 1-r is the decay factor

EXAMPLE 1

SOLUTION

STEP 1

Make a table of values

STEP 2

Plot the points from the table.

STEP 3

Draw, from right to left, a smooth curve that

begins just above the x-axis, passes through the

plotted points, and moves up to the left.

EXAMPLE 2

Graph the function.

SOLUTION

EXAMPLE 2

Graph the function.

SOLUTION

for Examples 1 and 2

GUIDED PRACTICE

Graph the function.

EXAMPLE 3

SOLUTION

The graphs asymptote is the line y 2. The

domain is all real numbers, and the range is y gt

2.

EXAMPLE 4

Solve a multi-step problem

Write an exponential decay model giving the

snowmobiles value y (in dollars) after t years.

Estimate the value after 3 years.

Graph the model.

Use the graph to estimate when the value of the

snowmobile will be 2500.

EXAMPLE 4

Solve a multi-step problem

SOLUTION

STEP 1

The initial amount is a 4200 and the percent

decrease is r 0.10. So, the exponential decay

model is

Write exponential decay model.

Substitute 4200 for a and 0.10 for r.

Simplify.

EXAMPLE 4

Solve a multi-step problem

STEP 2

The graph passes through the points (0, 4200) and

(1, 3780).It has the t-axis as an asymptote. Plot

a few other points. Then draw a smooth curve

through the points.

STEP 3

Using the graph, you can estimate that the value

of the snowmobile will be 2500 after about 5

years.

for Examples 3 and 4

GUIDED PRACTICE

Graph the function. State the domain and range.

for Examples 3 and 4

GUIDED PRACTICE

Graph the function. State the domain and range.

for Examples 3 and 4

GUIDED PRACTICE

7. WHAT IF? In Example 4, suppose the value of

the snowmobile decreases by 20 each year. Write

and graph an equation to model this situation.

Use the graph to estimate when the value of the

snowmobile will be 2500.

for Examples 3 and 4

GUIDED PRACTICE

8. SNOWMOBILE The value of a snowmobile has been

decreasing by 7 each year since it was new.

After 3 years, the value is 3000. Find the

original cost of the snowmobile.

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