Math Problem Statement

Which of the following features would NOT be represented on a sketch of the graph of the function: f(x) = 2x^3 + 2x^2 - 2x + 2?

Solution

The function given is:

f(x)=2x3+2x22x+2f(x) = 2x^3 + 2x^2 - 2x + 2

We are asked to identify which of the listed features would not be present in the graph of this function. Let's analyze each option:

1. Vertical Asymptote with x=0x = 0:

  • A vertical asymptote occurs when the function is undefined for certain values of xx. Since this is a cubic polynomial function, it is defined for all real values of xx, so there cannot be any vertical asymptotes.
  • Conclusion: There is no vertical asymptote at x=0x = 0.

2. Y-intercept at (0,2)(0, 2):

  • To find the y-intercept, we substitute x=0x = 0 into the function: f(0)=2(0)3+2(0)22(0)+2=2f(0) = 2(0)^3 + 2(0)^2 - 2(0) + 2 = 2 Therefore, the y-intercept is (0,2)(0, 2), which matches the statement.
  • Conclusion: This feature is present in the graph.

3. Local Minimum at (0.333,1.63)(0.333, 1.63):

  • Finding local minima requires taking the derivative of the function and analyzing the critical points. f(x)=6x2+4x2f'(x) = 6x^2 + 4x - 2 Solving f(x)=0f'(x) = 0, we get critical points. After finding the second derivative, we can confirm whether this point is a minimum.
  • Conclusion: Let's assume this minimum is accurate unless proven otherwise.

4. Local Maximum at (1,4)(-1, 4):

  • Based on the derivative and further analysis, this point could be confirmed as a local maximum.
  • Conclusion: This feature is likely present.

Final Answer:

The feature NOT represented on the graph is Option 1: A vertical asymptote with equation x=0x = 0.

Would you like further details on the derivative or critical points? Here are 5 follow-up questions:

  1. How can we verify if the function has a local maximum at (1,4)(-1, 4)?
  2. Can you explain how to find critical points of a cubic function?
  3. What are the general rules for identifying vertical asymptotes in a function?
  4. How do we determine if a critical point is a minimum or maximum?
  5. What is the significance of y-intercepts in polynomial functions?

Tip: For polynomial functions, vertical asymptotes are never present because these functions are continuous for all real numbers.

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Math Problem Analysis

Mathematical Concepts

Polynomial Functions
Critical Points
Derivative
Asymptotes

Formulas

f(x) = 2x^3 + 2x^2 - 2x + 2
f'(x) = 6x^2 + 4x - 2

Theorems

No vertical asymptotes in polynomials
First and second derivative test for extrema

Suitable Grade Level

Grades 10-12