Math Problem Statement

The graph of the polynomial f(x) is given below. If f(x) has degree 4, find the factored equation for f(x).

Solution

The graph provided shows the polynomial f(x)f(x), and we are told that f(x)f(x) is a degree 4 polynomial. From the graph, we can extract the following key features:

  1. Degree 4 Polynomial: This means the polynomial has 4 roots (including multiplicities).
  2. Roots (x-intercepts): From the graph, the polynomial crosses the x-axis at x=2x = -2, x=0x = 0, and x=2x = 2.
    • At x=2x = -2, the graph appears to "bounce off" the x-axis, indicating this is a root with even multiplicity (likely multiplicity 2).
    • At x=0x = 0 and x=2x = 2, the graph crosses the x-axis, indicating these are roots with odd multiplicity (likely multiplicity 1).
  3. End Behavior: Since the graph falls as xx \to \infty and rises as xx \to -\infty, the leading coefficient of the polynomial must be negative.

Factored Form of f(x)f(x):

Given these observations, we can write the factored form of f(x)f(x) as: f(x)=a(x+2)2(x)(x2)f(x) = -a(x + 2)^2(x)(x - 2) where aa is a constant that can be determined by considering a specific point on the graph.

Determining aa:

Looking at the graph, we notice that the polynomial passes through the point (1,2)(1, 2). We can substitute x=1x = 1 and f(1)=2f(1) = 2 into the factored form to determine aa.

f(1)=a(1+2)2(1)(12)f(1) = -a(1 + 2)^2(1)(1 - 2) 2=a(3)2(1)(1)2 = -a(3)^2(1)(-1) 2=a(9)(1)2 = -a(9)(-1) 2=9a2 = 9a a=29a = \frac{2}{9}

Thus, the factored equation for f(x)f(x) is: f(x)=29(x+2)2x(x2)f(x) = -\frac{2}{9}(x + 2)^2x(x - 2)

Would you like more details, or do you have any further questions?

Here are some related questions you could explore:

  1. How do you verify the degree of a polynomial from its graph?
  2. What is the significance of the multiplicity of roots in a polynomial?
  3. How do you determine the leading coefficient of a polynomial from its graph?
  4. How can we find more precise values for specific points on a polynomial graph?
  5. What would change in the polynomial if the end behavior was reversed?

Tip: When analyzing a polynomial graph, always look at the behavior at the x-intercepts to determine root multiplicities.

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Math Problem Analysis

Mathematical Concepts

Polynomial Functions
Roots
Factoring

Formulas

Factored form of a polynomial
Multiplicities of roots
End behavior analysis

Theorems

Fundamental Theorem of Algebra
Multiplicity Theorem

Suitable Grade Level

Grades 11-12