Math Problem Statement

Write an equation for the polynomial graphed below.

Solution

To determine the equation of the polynomial from the given graph, we need to analyze its roots (x-intercepts), turning points, and end behavior. Here’s what we can observe from the graph:

  1. Roots (x-intercepts):

    • The graph appears to intersect the x-axis at x=4x = -4, x=0x = 0, and x=3x = 3. These are potential roots of the polynomial.
  2. Multiplicity of Roots:

    • At x=4x = -4, the graph crosses the x-axis, indicating that the root is likely of odd multiplicity (likely 1).
    • At x=0x = 0, the graph crosses the x-axis as well, suggesting this root is of odd multiplicity (likely 1).
    • At x=3x = 3, the graph touches the x-axis and then turns around, which suggests this root has even multiplicity (likely 2).
  3. End Behavior:

    • The polynomial rises on both ends of the graph, indicating an even degree polynomial (e.g., degree 4 or 6).
    • Since there are three distinct roots (x=4x = -4, x=0x = 0, and x=3x = 3) and one of them has a multiplicity of 2, a degree-4 polynomial is the simplest form that matches this behavior.
  4. Forming the Polynomial: Using the roots, we can construct the polynomial in the form: f(x)=a(x+4)(x)(x3)2f(x) = a(x + 4)(x)(x - 3)^2 Here, aa is a leading coefficient that determines the vertical stretch of the polynomial.

  5. Finding aa: To find aa, we need a point that lies on the polynomial. For example, if the graph provides a clear point like (1,2)(1, 2), we can plug this into the equation and solve for aa. If no such point is available, we can assume a=1a = 1 for simplicity: f(x)=(x+4)(x)(x3)2f(x) = (x + 4)(x)(x - 3)^2

This is the general form of the polynomial based on the provided graph.

Would you like more details or have any questions?

Related Questions:

  1. How do we determine the degree of a polynomial from its graph?
  2. What is the role of multiplicity in determining the shape of a polynomial graph?
  3. How does the end behavior of a polynomial depend on its leading term?
  4. How do you find the turning points of a polynomial function?
  5. What are some common methods for graphing polynomials?

Tip:

Always check the behavior near the x-intercepts to determine the multiplicity of roots; it helps in correctly constructing the polynomial's equation.

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Math Problem Analysis

Mathematical Concepts

Polynomial Functions
Roots and Multiplicity
End Behavior
Degree of Polynomials

Formulas

General form of a polynomial
Multiplicity of roots

Theorems

Fundamental Theorem of Algebra
Root Multiplicity Theorem

Suitable Grade Level

Grades 11-12