Math Problem Statement

find the absolute max and min values for f(x) = x^3 - 12x on the interval [0, 3]

Solution

To find the absolute maximum and minimum values of the function f(x)=x312xf(x) = x^3 - 12x on the interval [0,3][0, 3], follow these steps:

  1. Find the derivative: f(x)=3x212f'(x) = 3x^2 - 12

  2. Set the derivative equal to zero to find critical points: 3x212=0    x2=4    x=±23x^2 - 12 = 0 \implies x^2 = 4 \implies x = \pm 2 Only x=2x = 2 is in the interval [0,3][0, 3].

  3. Evaluate f(x)f(x) at the critical point and the endpoints of the interval:

    • At x=0x = 0: f(0)=0312(0)=0f(0) = 0^3 - 12(0) = 0
    • At x=2x = 2: f(2)=2312(2)=824=16f(2) = 2^3 - 12(2) = 8 - 24 = -16
    • At x=3x = 3: f(3)=3312(3)=2736=9f(3) = 3^3 - 12(3) = 27 - 36 = -9
  4. Compare the values:

    • f(0)=0f(0) = 0
    • f(2)=16f(2) = -16
    • f(3)=9f(3) = -9
  5. Determine absolute max and min:

    • The absolute maximum value is 00 at x=0x = 0.
    • The absolute minimum value is 16-16 at x=2x = 2.

Thus, the absolute maximum value is 00 and the absolute minimum value is 16-16.

If you have any questions or need further details, feel free to ask! Here are some related questions for further exploration:

  1. How does the behavior of f(x)f(x) change outside the interval [0,3][0, 3]?
  2. What would happen if the interval were [3,3][-3, 3]?
  3. Can you find the second derivative and discuss the concavity of f(x)f(x)?
  4. How do the critical points relate to the graph of f(x)f(x)?
  5. What are the implications of the function's behavior at endpoints?

Tip: When finding extrema, always check the endpoints in addition to critical points.

Ask a new question for Free

By Image

Drop file here or Click Here to upload

Math Problem Analysis

Mathematical Concepts

Calculus
Critical Points
Absolute Extrema

Formulas

f'(x) = 3x^2 - 12
Evaluate f(x) at critical points and endpoints

Theorems

Extreme Value Theorem

Suitable Grade Level

Grades 11-12