Question

the graph of a polynomial function is given. what is the smallest degree that the polynomial could have?

the smallest degree the polynomial could have is
(simplify your answer.)

Explanation:

Analyze the end behavior of the graph

Using the End Behavior of Polynomials knowledge point

• Left end: \(y \to -\infty\) as \(x \to -\infty\)
• Right end: \(y \to \infty\) as \(x \to \infty\)
• Since the ends point in opposite directions, the polynomial must have an odd degree.

Count the turning points of the graph

Using the Turning Points knowledge point

• The graph has one local maximum (peak) and one local minimum (valley).
• Total number of turning points: \(2\)

Determine the minimum degree

Using the Degree of Polynomial knowledge point

• A polynomial of degree \(n\) can have at most \(n - 1\) turning points.
• Therefore, \(n - 1 \ge 2 \implies n \ge 3\).
• Since \(n\) must be odd and \(n \ge 3\), the smallest possible degree is \(3\).

Answer:

The smallest degree the polynomial could have is <blank>3</blank>
(Simplify your answer.)