Math Problem Statement

Find the average rate of change of the function f(x) = -5x^3 - 4x^2 - 4x - 2 from x = -1 to x = 1.

Solution

To find the average rate of change of the function f(x)=5x34x24x2f(x) = -5x^3 - 4x^2 - 4x - 2 from x=1x = -1 to x=1x = 1, we 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=1b = 1.

Let's calculate:

  1. Find f(1)f(1): f(1)=5(1)34(1)24(1)2=5442=15f(1) = -5(1)^3 - 4(1)^2 - 4(1) - 2 = -5 - 4 - 4 - 2 = -15

  2. Find f(1)f(-1): f(1)=5(1)34(1)24(1)2=54+42=3f(-1) = -5(-1)^3 - 4(-1)^2 - 4(-1) - 2 = 5 - 4 + 4 - 2 = 3

  3. Now, calculate the average rate of change: Average Rate of Change=f(1)f(1)1(1)=1531+1=182=9\text{Average Rate of Change} = \frac{f(1) - f(-1)}{1 - (-1)} = \frac{-15 - 3}{1 + 1} = \frac{-18}{2} = -9

The average rate of change of the function from x=1x = -1 to x=1x = 1 is 9-9.

Would you like more details or have any questions?

Here are 5 related questions for practice:

  1. How would the average rate of change change if the interval was x=0x = 0 to x=2x = 2?
  2. What is the instantaneous rate of change of the function at x=1x = 1?
  3. Can you calculate the slope of the tangent line to the curve at x=0x = 0?
  4. How does the degree of the polynomial influence the overall behavior of the function?
  5. What is the value of f(x)f(x) at x=0.5x = 0.5?

Tip: The average rate of change gives a sense of the overall trend of the function over an interval, similar to the concept of slope for a linear function.

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Math Problem Analysis

Mathematical Concepts

Algebra
Calculus
Polynomial Functions

Formulas

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

Theorems

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Suitable Grade Level

Grades 10-12