Math Problem Statement

The graph of the exponential function f(x) = a^x is given. Find f(3) and f(-4) using the graph.

Solution

The image shows a graph of the exponential function f(x)=axf(x) = a^x. The goal is to determine f(3)f(3) and f(4)f(-4) based on the graph and the given information.

From the graph, we can observe:

  • f(0)=1f(0) = 1, because the graph passes through the point (0,1)(0, 1). This is typical for an exponential function f(x)=axf(x) = a^x, where f(0)=a0=1f(0) = a^0 = 1.
  • f(1)=2f(-1) = 2, meaning the function value at x=1x = -1 is 2. Using the exponential formula f(1)=a1=1af(-1) = a^{-1} = \frac{1}{a}, we get the equation 1a=2\frac{1}{a} = 2. Solving for aa, we find that a=12a = \frac{1}{2}.

Thus, the function is f(x)=(12)xf(x) = \left( \frac{1}{2} \right)^x.

Now, to find f(3)f(3) and f(4)f(-4):

  1. f(3)=(12)3=18f(3) = \left( \frac{1}{2} \right)^3 = \frac{1}{8}
  2. f(4)=(12)4=24=16f(-4) = \left( \frac{1}{2} \right)^{-4} = 2^4 = 16

So, the values are:

  • f(3)=18f(3) = \frac{1}{8}
  • f(4)=16f(-4) = 16

Would you like more details or have any further questions?

Here are 5 related questions for further exploration:

  1. How do we determine the base of an exponential function from a graph?
  2. What happens to the function f(x)=axf(x) = a^x as aa becomes larger or smaller?
  3. How does the behavior of f(x)=axf(x) = a^x differ when a>1a > 1 and 0<a<10 < a < 1?
  4. What is the significance of the point (0,1)(0, 1) on exponential function graphs?
  5. Can an exponential function have a negative base?

Tip: Exponential functions of the form f(x)=axf(x) = a^x grow or decay rapidly depending on whether aa is greater than or less than 1.

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Math Problem Analysis

Mathematical Concepts

Exponential Functions
Graph Analysis

Formulas

f(x) = a^x
f(-1) = 1/a

Theorems

Exponential Growth and Decay

Suitable Grade Level

Grades 10-12