Math Problem Statement

Identify the correct algebraic expression that matches the given cubic function graph with one real root at x = -5 and no other real roots.

Solution

The graph provided appears to be a cubic function with three real roots based on the way it intersects the x-axis. Let’s analyze the characteristics of this function to match it with the correct algebraic expression from the multiple-choice options.

Step-by-Step Analysis:

  1. Roots of the Function:

    • The function intersects the x-axis at x=5x = -5, which means x+5x + 5 is a factor.
    • There are two other points of interest on the x-axis, suggesting that the remaining factor should include two real roots or complex roots. Observing the shape of the curve, it does not cross the x-axis at these two points, which implies a quadratic term without real roots.
  2. Quadratic Term:

    • We need a quadratic term that has no real roots. The term (x2+4)(x^2 + 4) fits this criteria, as x2+4=0x^2 + 4 = 0 has complex roots x=±2ix = \pm 2i.
    • The term (x24)(x^2 - 4) has real roots x=±2x = \pm 2, which would lead to additional x-intercepts on the graph, which we don’t see. Therefore, we can rule out options with (x24)(x^2 - 4) in them.
  3. Matching the Options:

    • Based on the analysis, the function should have factors that include (x+5)(x + 5) and (x2+4)(x^2 + 4).
    • The correct answer is: f(x)=(x+5)(x2+4)f(x) = (x + 5)(x^2 + 4)

Answer

The correct option is: f(x)=(x+5)(x2+4)\boxed{f(x) = (x + 5)(x^2 + 4)}

Would you like a more detailed breakdown or have further questions?


Here are some related questions to expand on this topic:

  1. How can you determine the degree of a polynomial function based on its graph?
  2. What are the visual differences on a graph between a quadratic factor with real roots and one with complex roots?
  3. How does the behavior near the roots reflect the multiplicity of each root in a polynomial function?
  4. Why does a polynomial with complex roots not intersect the x-axis at those roots?
  5. What are the characteristics of even-degree and odd-degree polynomial functions based on their end behaviors?

Tip: When analyzing a polynomial function's graph, look for where the function intersects the x-axis to identify real roots, and observe the end behavior to determine the degree of the polynomial.

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Math Problem Analysis

Mathematical Concepts

Algebra
Cubic Functions
Polynomials

Formulas

f(x) = (x + 5)(x^2 + 4)

Theorems

Factor Theorem
Root Theorem
Quadratic Roots

Suitable Grade Level

Grades 10-12