Math Problem Statement

Consider the function:
g ( x )

− 4 x 2 + 5 x + 4

Find the average rate of change of
g ( x ) between the points
x

− 2 and
x

2 . Give your answer as an integer or reduced fraction.

Solution

The average rate of change of a function between two points is given by the formula:

g(b)g(a)ba\frac{g(b) - g(a)}{b - a}

where g(x)g(x) is the function, and aa and bb are the two given points.

Given g(x)=4x2+5x+4g(x) = -4x^2 + 5x + 4, a=2a = -2, and b=2b = 2, we need to:

  1. Calculate g(2)g(-2)
  2. Calculate g(2)g(2)
  3. Find the difference g(2)g(2)g(2) - g(-2)
  4. Divide the result by 2(2)=42 - (-2) = 4

Step 1: Calculate g(2)g(-2)

g(2)=4(2)2+5(2)+4=4(4)10+4=1610+4=22g(-2) = -4(-2)^2 + 5(-2) + 4 = -4(4) - 10 + 4 = -16 - 10 + 4 = -22

Step 2: Calculate g(2)g(2)

g(2)=4(2)2+5(2)+4=4(4)+10+4=16+10+4=2g(2) = -4(2)^2 + 5(2) + 4 = -4(4) + 10 + 4 = -16 + 10 + 4 = -2

Step 3: Find g(2)g(2)g(2) - g(-2)

g(2)g(2)=2(22)=2+22=20g(2) - g(-2) = -2 - (-22) = -2 + 22 = 20

Step 4: Divide by ba=2(2)=4b - a = 2 - (-2) = 4

g(2)g(2)2(2)=204=5\frac{g(2) - g(-2)}{2 - (-2)} = \frac{20}{4} = 5

Thus, the average rate of change of g(x)g(x) between x=2x = -2 and x=2x = 2 is:

5\boxed{5}

Would you like more details on any step or have any questions?

Here are 5 related questions to expand on this:

  1. What is the interpretation of the average rate of change in the context of functions?
  2. How would you calculate the instantaneous rate of change at a specific point?
  3. Can the average rate of change be negative? If so, what does that imply?
  4. How is the average rate of change related to the slope of a secant line?
  5. How would the average rate of change differ if we were given different points?

Tip: The average rate of change is similar to finding the slope between two points on a graph of the function.

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Math Problem Analysis

Mathematical Concepts

Algebra
Quadratic Functions
Rate of Change

Formulas

Average rate of change formula: (g(b) - g(a)) / (b - a)
Quadratic function: ax^2 + bx + c

Theorems

Secant Line Theorem

Suitable Grade Level

Grades 9-10