Math Problem Statement

Find the average rate of change of f from x = -1 to x = 3. Give your answer as an integer or reduced fraction.

Solution

To calculate the average rate of change of the function f(x)f(x) from x=1x = -1 to x=3x = 3, we can use the formula:

Average Rate of Change=f(b)f(a)ba\text{Average Rate of Change} = \frac{f(b) - f(a)}{b - a}

Where:

  • a=1a = -1 and b=3b = 3,
  • f(a)f(a) is the value of the function at x=1x = -1,
  • f(b)f(b) is the value of the function at x=3x = 3.

Step 1: Find f(1)f(-1)

From the graph:

  • When x=1x = -1, the corresponding value of f(x)f(x) appears to be f(1)=2f(-1) = 2.

Step 2: Find f(3)f(3)

From the graph:

  • When x=3x = 3, the corresponding value of f(x)f(x) appears to be f(3)=1f(3) = 1.

Step 3: Apply the formula

Now, substituting the values into the formula:

Average Rate of Change=f(3)f(1)3(1)=123(1)=14=14\text{Average Rate of Change} = \frac{f(3) - f(-1)}{3 - (-1)} = \frac{1 - 2}{3 - (-1)} = \frac{-1}{4} = -\frac{1}{4}

Thus, the average rate of change of f(x)f(x) from x=1x = -1 to x=3x = 3 is 14-\frac{1}{4}.


Would you like further clarification or details on any of the steps? Here are five related questions to deepen your understanding:

  1. How is the average rate of change related to the slope of a line?
  2. What does a negative average rate of change indicate about the graph's behavior?
  3. How do you interpret the rate of change in terms of real-world applications?
  4. Can the average rate of change be calculated over different intervals on the same graph?
  5. How would the answer change if we selected different points, like x=2x = -2 to x=1x = 1?

Tip: The average rate of change between two points on a graph is the same as the slope of the secant line connecting those two points.

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Math Problem Analysis

Mathematical Concepts

Algebra
Rate of Change
Functions
Slope of Secant Line

Formulas

Average Rate of Change = (f(b) - f(a)) / (b - a)

Theorems

Slope of Secant Line Theorem

Suitable Grade Level

Grades 8-10