Math Problem Statement

answer

Select the option that represents the ordering of the functions f(x), g(x), and h(x) according to their average rates of change on the interval 1 ≤ x ≤ 3 from least to greatest.

Solution

To solve this problem, we need to compute the average rates of change for each function f(x)f(x), g(x)g(x), and h(x)h(x) over the interval 1x31 \leq x \leq 3, and then order them from least to greatest.

Step 1: Average Rate of Change Formula

The average rate of change of a function y=f(x)y = f(x) over an interval [a,b][a, b] is given by:

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

We will apply this formula to each of the three functions over the interval [1,3][1, 3].


Step 2: Finding Average Rate of Change for g(x)g(x)

From the table, we can see that:

  • g(1)=3g(1) = 3
  • g(3)=3g(3) = 3

Thus, the average rate of change for g(x)g(x) over [1,3][1, 3] is:

g(3)g(1)31=332=0\frac{g(3) - g(1)}{3 - 1} = \frac{3 - 3}{2} = 0


Step 3: Finding Average Rate of Change for h(x)h(x)

The function h(x)h(x) is given as h(x)=x22x+10h(x) = x^2 - 2x + 10. We calculate:

  • h(1)=122(1)+10=9h(1) = 1^2 - 2(1) + 10 = 9
  • h(3)=322(3)+10=13h(3) = 3^2 - 2(3) + 10 = 13

Thus, the average rate of change for h(x)h(x) over [1,3][1, 3] is:

h(3)h(1)31=1392=42=2\frac{h(3) - h(1)}{3 - 1} = \frac{13 - 9}{2} = \frac{4}{2} = 2


Step 4: Finding Average Rate of Change for f(x)f(x)

Using the graph of f(x)f(x), estimate:

  • f(1)4f(1) \approx 4
  • f(3)4f(3) \approx -4

Thus, the average rate of change for f(x)f(x) over [1,3][1, 3] is:

f(3)f(1)31=442=82=4\frac{f(3) - f(1)}{3 - 1} = \frac{-4 - 4}{2} = \frac{-8}{2} = -4


Step 5: Ordering the Rates of Change

The average rates of change for the three functions are:

  • f(x)f(x): -4
  • g(x)g(x): 0
  • h(x)h(x): 2

Thus, the ordering from least to greatest is:

f(x)<g(x)<h(x)f(x) < g(x) < h(x)

Final Answer: The correct ordering of the functions according to their average rates of change is f(x)<g(x)<h(x)f(x) < g(x) < h(x).

Would you like more details or have any questions?

Related Questions:

  1. What does the average rate of change represent geometrically?
  2. How do we interpret a rate of change of 0 for a function?
  3. Can the average rate of change be negative and what does that signify?
  4. How does the formula for the average rate of change relate to the slope of a line?
  5. What is the difference between instantaneous rate of change and average rate of change?

Tip:

When calculating the average rate of change from a graph, always carefully estimate the function values at the endpoints to avoid rounding errors.

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Math Problem Analysis

Mathematical Concepts

Average Rate of Change
Functions
Interval Analysis
Quadratic Functions

Formulas

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

Theorems

Definition of Average Rate of Change

Suitable Grade Level

Grades 9-11