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Algebra 1

5.13.3 Comparing Exponential Functions

Algebra 15.13.3 Comparing Exponential Functions

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Activity

Here are graphs representing two functions and descriptions of two functions.

A graph with area (square inches) on the y-axis and time (months) on the x-axis; two upward-curving lines are shown, with a labeled point (p, q) where the lines intersect.  The solid line has an y-intercept closer to 0 then the dashed line.
  • Function ff: The area of a wall that is covered by Mold A, in square inches, doubling every month.
  • Function gg: The area of a wall that is covered by Mold B, in square inches, tripling every month.

1. Which graph represents each function? Explain your answer.

2. When the mold was first spotted and measured, was there more of Mold A or Mold B? Explain how you know.

3. What does the point (p,q)(p,q) tell us in this situation? Explain your answer.

Self Check

In the formula f ( x ) = a b x , what changes on the graph when a changes?
  1. The growth factor
  2. The slope
  3. The y -intercept
  4. The x -intercept

Additional Resources

Reading Exponential Graphs

The graphs of ff and gg are located below and are functions of the form y=a·bxy=a·bx.

Graph of exponential growth functions, f and g. Function g has a smaller y-intercept and climbs more quickly than function f.

Which curve has the larger aa value?

f(x)f(x) because its yy-intercept is higher.

Which curve has the larger bb value?

g(x)g(x) because it is growing more quickly.

Try it

Try It: Reading Exponential Graphs

The graphs of ff and gg are located below and are functions of the form y=abxy=abx.

Graph of exponential growth functions, f and g. Function f has a smaller y-intercept and climbs more quickly than function g.

Which curve has the larger bb value?

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