Use the image to answer the question.

A U-shaped downward opening curve with 4 plotted points is on a coordinate plane. The x-axis ranges from negative 1 to 9 in increments of 1. The y-axis ranges from negative 10 to 100 in increments of 10.

A quadratic function is graphed. Compare the estimated average rate of change for the quadratic function to the estimated average rate of change for the exponential function y=−6x
on the interval [0,5]
. Use one of the symbols <
, =
, or >
to describe the comparison.

(1 point)
The estimated average rate of change of the quadratic function
the estimated average rate of change of the exponential function.

1 answer

To compare the estimated average rate of change of the quadratic function on the interval [0, 5] to the estimated average rate of change of the exponential function \( y = -6x \) on the same interval, we first need to calculate the average rates of change for both functions.

  1. Quadratic Function: Let's denote the quadratic function as \( f(x) \). To find the average rate of change on the interval [0, 5], we use the formula: \[ \text{Average Rate of Change} = \frac{f(b) - f(a)}{b - a} \] where \( a = 0 \) and \( b = 5 \).

    Assuming from the graph that \( f(0) \) and \( f(5) \) can be estimated (you would take the corresponding y-values for these x-values from the graph). Suppose, for instance, \( f(0) \approx 10 \) and \( f(5) \approx 50 \) (these need to be derived from the actual plotted points).

    Then: \[ \text{Average Rate of Change} = \frac{f(5) - f(0)}{5 - 0} = \frac{50 - 10}{5} = \frac{40}{5} = 8. \]

  2. Exponential Function: Now, we'll calculate the average rate of change for \( y = -6x \) on the same interval: \[ y(0) = -6(0) = 0, \] \[ y(5) = -6(5) = -30. \] Using the same average rate of change formula: \[ \text{Average Rate of Change} = \frac{-30 - 0}{5 - 0} = \frac{-30}{5} = -6. \]

  3. Comparison: Now we can compare the average rates of change we calculated:

    • Average rate of change for the quadratic function: \( 8 \)
    • Average rate of change for the exponential function: \( -6 \)

Since \( 8 > -6 \), we conclude: The estimated average rate of change of the quadratic function > the estimated average rate of change of the exponential function.

Therefore, the final statement is: The estimated average rate of change of the quadratic function > the estimated average rate of change of the exponential function.