Math  /  Algebra

QuestionWhat is the least possible degree of the polynomial graphed above? \square

Studdy Solution

STEP 1

1. The graph of the polynomial has three turning points.
2. The polynomial crosses the x-axis at three distinct points: x=2 x = -2 , x=1 x = 1 , and x=4 x = 4 .
3. The polynomial is a real-valued function.

STEP 2

1. Understand the relationship between turning points and the degree of a polynomial.
2. Use the x-intercepts to infer the degree of the polynomial.
3. Determine the least possible degree of the polynomial.

STEP 3

The number of turning points in a polynomial graph is at most n1 n-1 , where n n is the degree of the polynomial.
Given that there are three turning points, the degree n n must satisfy n13 n-1 \geq 3 .

STEP 4

The polynomial crosses the x-axis at three distinct points, which suggests that the polynomial has at least three distinct linear factors.
A polynomial with k k distinct roots can have a degree of at least k k .

STEP 5

Combining the information from the turning points and the x-intercepts, the least degree n n must satisfy both conditions: n13 n-1 \geq 3 and n3 n \geq 3 .
The smallest integer n n that satisfies both conditions is n=4 n = 4 .
The least possible degree of the polynomial is:
4 \boxed{4}

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