Math Problem Statement

A polynomial p is graphed. What could be the equation of p? (Multiple-choice options provided.)

Solution

From the graph, we can make several observations:

  1. The graph crosses the x-axis at x=0x = 0 and x=2x = -2. These points represent the roots of the polynomial, and they appear to have even multiplicities because the curve touches but does not cross the x-axis at these points.
  2. The behavior near x=0x = 0 suggests the root at x=0x = 0 has a higher multiplicity than that at x=2x = -2, as the graph flattens out more near this point.
  3. The graph dips between the roots, indicating a negative coefficient for the highest degree term.

Now let's analyze the answer choices:

  • p(x)=x2(x+2)2p(x) = x^2(x + 2)^2: This represents a polynomial with both roots x=0x = 0 and x=2x = -2 having multiplicity 2. This would result in a more symmetric graph around the x-axis, so this is likely not the correct answer.
  • p(x)=x2(x+2)3p(x) = x^2(x + 2)^3: The root at x=0x = 0 has multiplicity 2, while the root at x=2x = -2 has multiplicity 3. This might produce the behavior we see in the graph, as the root at x=2x = -2 is less flat than at x=0x = 0, but it doesn’t match the observation that the curve touches the x-axis at x=2x = -2 without crossing.
  • p(x)=x3(x+2)3p(x) = x^3(x + 2)^3: Both roots would have odd multiplicities, meaning the curve would cross the x-axis at both points, which doesn't fit the graph.
  • p(x)=x3(x+2)2p(x) = x^3(x + 2)^2: The root at x=0x = 0 has multiplicity 3, and the root at x=2x = -2 has multiplicity 2. This matches the graph because the curve flattens at x=0x = 0 (indicating higher multiplicity), and touches at x=2x = -2 (indicating even multiplicity).

The correct answer is D: p(x)=x3(x+2)2p(x) = x^3(x + 2)^2.

Would you like more details on the reasoning process or have any questions?

Here are 5 related questions for further exploration:

  1. How does the multiplicity of a root affect the shape of the graph at that root?
  2. What is the general form of a polynomial if you know its roots and their multiplicities?
  3. How can you determine the leading term of a polynomial from its graph?
  4. How does the end behavior of a polynomial help in identifying its degree?
  5. What are the differences in graph behavior between even and odd multiplicity roots?

Tip: The degree of a polynomial is the sum of the multiplicities of its roots, and it dictates the end behavior of the graph.

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Math Problem Analysis

Mathematical Concepts

Polynomials
Roots and Multiplicities
Graph Interpretation

Formulas

General form of a polynomial equation
Behavior of polynomials at roots with different multiplicities

Theorems

Multiplicity of roots affecting graph behavior
End behavior of polynomials based on degree

Suitable Grade Level

Grades 10-12