Math Problem Statement

The exponential function decays at one-half the rate of the quadratic function.

The exponential function decays at the same rate as the quadratic function.

The exponential function decays at two-thirds the rate of the quadratic function.

The exponential function decays at three-fourths the rate of the quadratic function.

A quadratic function and an exponential function are graphed below. How do the decay rates of the functions compare over the interval -2 ≤ x ≤ 0?

Solution

To analyze the decay rates of the functions over the interval 2x0-2 \leq x \leq 0, let’s break down what the graph shows.

  • Blue curve: This appears to represent the quadratic function.
  • Pink curve: This is likely the exponential function.

In general:

  1. Quadratic functions (e.g., y=ax2y = ax^2) decrease and then increase symmetrically as xx moves from negative to positive values.
  2. Exponential functions (e.g., y=abxy = a \cdot b^x, with 0<b<10 < b < 1 for decay) decrease much more rapidly than polynomials at first, but their decay slows as they approach the x-axis.

Observing Decay in the Interval 2x0-2 \leq x \leq 0

  • Both functions are decreasing in this interval, but their rates are different.
  • Exponential decay tends to happen more quickly than quadratic decay for small negative values of xx.
  • The slope (rate of decrease) of the pink curve (exponential) is steeper than the slope of the blue curve (quadratic) initially near x=2x = -2, but their decay seems to stabilize towards 0 at different rates.

Selecting the Best Answer:

From the provided options:

  1. "The exponential function decays at one-half the rate of the quadratic function": This seems unlikely because exponential decay is typically stronger than quadratic decay at the start.
  2. "The exponential function decays at the same rate as the quadratic function": Not correct; their rates differ noticeably.
  3. "The exponential function decays at two-thirds the rate of the quadratic function": This might fit if the exponential function were only slightly slower, but still not the best match.
  4. "The exponential function decays at three-fourths the rate of the quadratic function": This option aligns better if the quadratic function decays only slightly faster over the interval 2x0-2 \leq x \leq 0.

Conclusion:

Based on the behavior observed from the graph, the most reasonable answer is likely: "The exponential function decays at three-fourths the rate of the quadratic function." The graph suggests that the quadratic function decays a bit faster over the interval in question.


Do you want more details on how I identified the decay rates or further explanation on exponential and quadratic behavior?

Here are five related questions you might explore:

  1. How do you calculate decay rates mathematically for exponential and quadratic functions?
  2. What happens to exponential functions as xx \rightarrow -\infty?
  3. How does the rate of change differ between linear, quadratic, and exponential functions?
  4. What are some real-world applications where exponential decay is more relevant than quadratic decay?
  5. How do slopes and tangents explain decay behavior?

Tip: To compare decay rates quantitatively, you can calculate the derivative (slope) of both functions over the given interval.

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Math Problem Analysis

Mathematical Concepts

Exponential Decay
Quadratic Functions
Rates of Change
Graph Interpretation

Formulas

Exponential decay formula y = a * b^x (0 < b < 1)
Quadratic formula y = ax^2 + bx + c

Theorems

Rate of change for exponential functions
Rate of change for quadratic functions

Suitable Grade Level

Grades 9-12