Math Problem Statement
The polynomial of degree 4,
P
(
x
)
has a root of multiplicity 2 at
x
4
and roots of multiplicity 1 at
x
0
and
x
−
3
. The graph passes through the point
(
−
1
,
−
200
)
.
Find a formula for
P
(
x
)
.
P ( x )
Solution
The polynomial has the following characteristics:
- A root of multiplicity 2 at .
- Roots of multiplicity 1 at and .
- It passes through the point .
Step 1: Express in factored form
Given the information about the roots and their multiplicities, the polynomial can be written as: where is a constant to be determined.
Step 2: Use the point
We know that . Substitute into the polynomial to solve for :
Simplifying the expression inside the parentheses:
Now calculate the powers and products:
Step 3: Solve for
Step 4: Write the final formula
Now substitute back into the factored form of the polynomial:
This is the formula for the polynomial .
Would you like further details or have any questions?
Here are 5 related questions to explore:
- How do we know the degree of the polynomial based on the roots and their multiplicities?
- What does it mean for a root to have multiplicity 2 versus multiplicity 1?
- How can you find the constant if a point is not given?
- How do changes in the coefficient affect the graph of the polynomial?
- How would the polynomial change if another point on the graph was given instead of ?
Tip: Always verify your solution by substituting points given in the problem into your equation.
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Math Problem Analysis
Mathematical Concepts
Polynomial Functions
Algebra
Roots of Polynomials
Formulas
Factored form of a polynomial: P(x) = a(x - r1)^m1(x - r2)^m2 ...
Finding a polynomial constant using a given point: P(x) = a(x - r1)^m1(x - r2)^m2 ...
Theorems
Fundamental Theorem of Algebra
Multiplicity of Roots
Suitable Grade Level
Grades 10-12