Math Problem Statement

Find the zeros for the polynomial function and give the multiplicity for each zero. State whether the graph crosses the x-axis or touches the x-axis and turns around at each zero.

Solution

Let's analyze the given polynomial function:

f(x)=3(x2)(x+4)2f(x) = -3(x - 2)(x + 4)^2

Step 1: Finding the Zeros

The zeros of the function occur when f(x)=0f(x) = 0. Setting the equation equal to zero:

3(x2)(x+4)2=0-3(x - 2)(x + 4)^2 = 0

This equation will be zero when either factor equals zero:

  • x2=0x - 2 = 0 gives x=2x = 2.
  • (x+4)2=0(x + 4)^2 = 0 gives x=4x = -4.

Thus, the zeros are x=2x = 2 and x=4x = -4.

Step 2: Determining Multiplicities

  • x=2x = 2 comes from the factor (x2)(x - 2), which is raised to the power of 1. Therefore, its multiplicity is 1.
  • x=4x = -4 comes from the factor (x+4)2(x + 4)^2, which is raised to the power of 2. Therefore, its multiplicity is 2.

Step 3: Behavior at the Zeros

  • At x=2x = 2 (multiplicity 1), the graph crosses the x-axis because the multiplicity is odd.
  • At x=4x = -4 (multiplicity 2), the graph touches the x-axis and turns around because the multiplicity is even.

Step 4: Answering the Multiple-Choice Question

In the multiple-choice options, the correct choice is:

  • A: There are two zeros. The multiplicity of the largest zero (in absolute value, 4-4) is 2. The multiplicity of the smallest zero (in absolute value, 22) is 1.

Do you need further clarification or details?


Here are 5 related questions for practice:

  1. How would the graph change if the multiplicity of (x+4)2(x + 4)^2 was 3 instead of 2?
  2. What are the end behaviors of the function f(x)=3(x2)(x+4)2f(x) = -3(x - 2)(x + 4)^2?
  3. How does the negative sign in front of the function f(x)f(x) affect the graph?
  4. What happens to the graph if (x+4)2(x + 4)^2 becomes (x+4)4(x + 4)^4?
  5. How do you find the y-intercept of this function?

Tip: For polynomial functions, zeros with odd multiplicities cross the x-axis, while zeros with even multiplicities touch and turn around at the x-axis.

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Math Problem Analysis

Mathematical Concepts

Polynomial Functions
Zeros of Functions
Multiplicity

Formulas

Zero of a polynomial: Set f(x) = 0
Multiplicity: The exponent of the factor associated with each zero

Theorems

Fundamental Theorem of Algebra

Suitable Grade Level

Grades 9-12