Math Problem Statement

For the equation f(x) = (x - 2)(x + 4)(x - 3), find the x-intercepts, y-intercept, degree of the polynomial, end behavior, and turning points. Sketch the graph.

Solution

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Given Information:

The equation provided is f(x)=(x2)(x+4)(x3)f(x) = (x - 2)(x + 4)(x - 3). The goal is to find several characteristics of this polynomial:

  1. X-Intercepts: The roots of the polynomial are already calculated as:

    • x=2,4,3x = 2, -4, 3 (from solving f(x)=0f(x) = 0).
  2. Y-Intercept: To find the yy-intercept, substitute x=0x = 0 into f(x)f(x): f(0)=(02)(0+4)(03)=(2)(4)(3)=24f(0) = (0 - 2)(0 + 4)(0 - 3) = (-2)(4)(-3) = 24 So, the yy-intercept is (0,24)(0, 24).

  3. Degree of Polynomial: The degree of the polynomial is determined by the highest power of xx when expanded. Here, f(x)f(x) has three linear factors ((x2),(x+4),(x3)(x - 2), (x + 4), (x - 3)), so the degree is: Degree=3\text{Degree} = 3

  4. End Behavior: Since this is a cubic polynomial (odd degree) with a positive leading coefficient (from x3x^3), the end behavior is:

    • As xx \to -\infty, f(x)f(x) \to -\infty.
    • As x+x \to +\infty, f(x)+f(x) \to +\infty.
  5. Turning Points: A degree-3 polynomial can have at most Degree1=2\text{Degree} - 1 = 2 turning points. The exact coordinates of the turning points require finding the critical points (derivative set to zero). However, they are not computed explicitly on this sheet.


Summary of Answers:

  1. X-Intercepts: 2,4,32, -4, 3.
  2. Y-Intercept: (0,24)(0, 24).
  3. Degree of Polynomial: 3.
  4. End Behavior:
    • xx \to -\infty: yy \to -\infty.
    • x+x \to +\infty: y+y \to +\infty.
  5. Turning Point: Needs further calculation (critical points).

Do you want me to compute the turning points or provide a detailed graph explanation?


Additional Related Questions:

  1. What is the expanded form of f(x)=(x2)(x+4)(x3)f(x) = (x - 2)(x + 4)(x - 3)?
  2. How do you find the critical points of a cubic function?
  3. How can you use the end behavior to sketch the graph of this function?
  4. Why does a cubic polynomial have at most two turning points?
  5. How do you determine the leading coefficient of a polynomial in factored form?

Tip: When finding turning points, always compute the first derivative f(x)f'(x) and solve f(x)=0f'(x) = 0 to locate the critical points.

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Math Problem Analysis

Mathematical Concepts

Polynomial Functions
Factored Form
Intercepts
End Behavior
Turning Points

Formulas

Factored form of polynomial: f(x) = (x - r1)(x - r2)...
Y-intercept: f(0)
Degree of polynomial: Sum of degrees of factors
End behavior of polynomials: Determined by leading term

Theorems

Fundamental Theorem of Algebra

Suitable Grade Level

Grades 9-12