Math Problem Statement

How do you graph the exponential function f(x) = (4/3)^x?

Solution

The task is to graph the exponential function:

f(x)=(43)xf(x) = \left(\frac{4}{3}\right)^x

To do this, you'll need to calculate the function values f(x)f(x) for specific xx-values and plot the points. Let's break it down step-by-step:


Step 1: Choose xx-values

Common choices for xx include: 2,1,0,1,2-2, -1, 0, 1, 2.

Step 2: Calculate f(x)f(x)

We calculate f(x)f(x) for each chosen xx:

  • For x=2x = -2: f(2)=(43)2=(34)2=9160.56f(-2) = \left(\frac{4}{3}\right)^{-2} = \left(\frac{3}{4}\right)^2 = \frac{9}{16} \approx 0.56
  • For x=1x = -1: f(1)=(43)1=34=0.75f(-1) = \left(\frac{4}{3}\right)^{-1} = \frac{3}{4} = 0.75
  • For x=0x = 0: f(0)=(43)0=1f(0) = \left(\frac{4}{3}\right)^0 = 1
  • For x=1x = 1: f(1)=(43)1=431.33f(1) = \left(\frac{4}{3}\right)^1 = \frac{4}{3} \approx 1.33
  • For x=2x = 2: f(2)=(43)2=1691.78f(2) = \left(\frac{4}{3}\right)^2 = \frac{16}{9} \approx 1.78

Step 3: Plot Points

The five points to plot are approximately:

  • (2,0.56)(-2, 0.56)
  • (1,0.75)(-1, 0.75)
  • (0,1)(0, 1)
  • (1,1.33)(1, 1.33)
  • (2,1.78)(2, 1.78)

Step 4: Sketch the Graph

After plotting these points, draw a smooth curve that increases as xx increases, reflecting the growth of the exponential function (43)x\left(\frac{4}{3}\right)^x.


Would you like additional details on how to plot this graph or verify the calculations?


Related Questions:

  1. What happens to f(x)f(x) as xx approaches negative infinity?
  2. How does (43)x\left(\frac{4}{3}\right)^x differ from 2x2^x in terms of growth rate?
  3. How would the graph look if the base were less than 1, e.g., f(x)=(34)xf(x) = \left(\frac{3}{4}\right)^x?
  4. Can you derive the general formula for the slope of this function at any point?
  5. How does the horizontal asymptote of f(x)=(43)xf(x) = \left(\frac{4}{3}\right)^x affect the graph?

Tip:

In exponential functions of the form f(x)=bxf(x) = b^x, the base b>1b > 1 indicates growth, while 0<b<10 < b < 1 indicates decay.

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Math Problem Analysis

Mathematical Concepts

Exponential Functions
Function Evaluation
Graphing

Formulas

f(x) = (4/3)^x

Theorems

Exponential Growth

Suitable Grade Level

Grades 9-11