Math Problem Statement

Consider the following polynomial functions: g(x) = 2x^3 - 4x^2 - 6x and h(x) = -(x - 4)^3(x - 1). Choose the graph of each function from the choices below (graphs A-F).

Solution

Let's analyze the two functions provided in the problem:

  1. g(x)=2x34x26xg(x) = 2x^3 - 4x^2 - 6x
  2. h(x)=(x4)3(x1)h(x) = -(x - 4)^3(x - 1)

Step 1: Analyze the function g(x)=2x34x26xg(x) = 2x^3 - 4x^2 - 6x

  • Degree: 3 (cubic), so the end behavior will be like x3x^3:

    • As xx \to -\infty, g(x)g(x) \to -\infty
    • As xx \to \infty, g(x)g(x) \to \infty
  • Zeros: Factor the function:
    g(x)=2x(x22x3)g(x) = 2x(x^2 - 2x - 3)
    Factor further:
    g(x)=2x(x3)(x+1)g(x) = 2x(x - 3)(x + 1)
    Zeros: x=0,3,1x = 0, 3, -1

  • Behavior at Zeros: Since these are all linear factors, the graph crosses the x-axis at each zero.

  • Overall Shape: Typical cubic function with three x-intercepts and end behavior like x3x^3.

Step 2: Analyze the function h(x)=(x4)3(x1)h(x) = -(x - 4)^3(x - 1)

  • Degree: 3+1=43 + 1 = 4 (quartic), so the end behavior will be like x4-x^4:

    • As x±x \to \pm\infty, h(x)h(x) \to -\infty (because of the negative sign)
  • Zeros: h(x)=0h(x) = 0 when x=4x = 4 (with multiplicity 3) and x=1x = 1 (with multiplicity 1)

  • Behavior at Zeros:

    • At x=4x = 4, the graph touches the x-axis and turns around because of the cubic multiplicity.
    • At x=1x = 1, the graph crosses the x-axis because of the linear factor.
  • Overall Shape: The graph will have a turning point at x=4x = 4, cross the x-axis at x=1x = 1, and show downward behavior at both ends.

Step 3: Match Functions to Graphs

  • Graph matching:
    • Graph B corresponds to g(x)=2x34x26xg(x) = 2x^3 - 4x^2 - 6x (cubic with three distinct x-intercepts and end behavior of a cubic).
    • Graph E corresponds to h(x)=(x4)3(x1)h(x) = -(x - 4)^3(x - 1) (quartic with end behavior of x4-x^4, touches at x=4x = 4, crosses at x=1x = 1).

Final Answer:

  • Graph B for g(x)g(x)
  • Graph E for h(x)h(x)

Would you like further explanation on any step?

Here are 5 related questions you can explore:

  1. How do you determine the end behavior of a polynomial function based on its degree?
  2. Why does the multiplicity of a zero affect whether the graph crosses or touches the x-axis?
  3. How can you factor a cubic polynomial to find its roots?
  4. What is the significance of turning points in polynomial graphs?
  5. How does a negative leading coefficient affect the overall shape of a polynomial graph?

Tip: Remember that polynomial graphs often reflect their degree and leading coefficient in their end behavior and general shape.

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Math Problem Analysis

Mathematical Concepts

Polynomials
Graphing Functions
Zeros and Multiplicity
End Behavior

Formulas

Polynomial factorization: ax^3 + bx^2 + cx + d
Multiplicity rules for roots

Theorems

Fundamental Theorem of Algebra
End Behavior of Polynomial Functions

Suitable Grade Level

Grades 10-12