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Finding a Polynomial Function, find a polynomial of degree \(n\) that has the given zero(s). (There are many correct answers.) $$ \begin{array}{ll}{\mathrm{Zero}(\mathrm{s})} & {\text { Degree }} \\\ {x=-5,0,1} \quad & {n=3}\end{array} $$

Short Answer

Expert verified
The polynomial function with degree 3 with zeros at x=-5, 0, 1 is \(f(x) = x^3 + 4x^2 - 5x\).

Step by step solution

01

Identify the zeros

The zeros given in the problem are x=-5, 0 and 1. These values of x make the polynomial zu equal zero.
02

Write the factors

Write each zero as a factor of the polynomial. The factor corresponding to each zero is obtained by setting the zero equal to x and then changing the sign. The corresponding factors for the given zeros -5, 0 and 1 are \(x+5\), \(x-0\) and \(x-1\) respectively.
03

Construct the polynomial

A polynomial function that has the given zeros can be obtained by multiplying the factors together. This gives the polynomial \(f(x) = (x+5)(x-0)(x-1)\). Expanding this expression will result in the polynomial function \(f(x) = x^3 + 4x^2 - 5x\).

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Understanding Polynomial Zeros
Polynomial zeros are the values of \(x\) that make the polynomial equal to zero. These are also known as the roots of the polynomial. For example, if \(x = -5, 0,\) and \(1\) are zeros of a polynomial, this means that substituting these values into the polynomial function results in the function equaling zero.

In the exercise, the zeros \(x = -5, 0,\) and \(1\) were provided. Each zero corresponds to a factor of the polynomial, highlighting the essential link between zeros and factors. Understanding how to determine these zeros is crucial for constructing polynomial functions. When you "solve" a polynomial, you are often seeking its zeros.
Degree of Polynomial Explained
The degree of a polynomial is the highest power of \(x\) in the polynomial. It is a critical indicator of the polynomial's behavior and characteristics. For instance, a polynomial with a degree of 3 will have an \(x^3\) term as the highest power. This means it's a cubic polynomial.

The degree influences the shape and the number of zeros a polynomial function might have. In this exercise, we were tasked with finding a cubic polynomial (degree 3), which naturally accommodates the three zeros given: \(-5, 0,\) and \(1\). The degree also helps in predicting the number of possible turning points and the end behavior of the polynomial's graph.
Factorization of Polynomials
Factorization involves expressing a polynomial as a product of its factors. This technique is particularly important because it makes it easier to find the polynomial's zeros. In our example, the zeros \(-5, 0,\) and \(1\) give rise to factors \((x + 5), (x - 0),\) and \((x - 1)\).

To form the polynomial, multiply these factors: \((x+5)(x-0)(x-1)\). By expanding the expression, you get \(x^3 + 4x^2 - 5x\), the polynomial that has the given zeros and meets the degree requirement.

Factorization not only aids in forming polynomials but also in breaking down complex polynomials into simpler, manageable components. It is a vital skill for both constructing and solving polynomial equations.

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Most popular questions from this chapter

Graphical Analysis In Exercises \(63-66,\) use a graphing utility to graph the rational function. State the domain of the function and find any asymptotes. Then zoom out sufficiently far so that the graph appears as a line. Identify the line. $$f(x)=\frac{2 x^{2}+x}{x+1}$$

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Intensity of Sound In Exercises \(47-50\) , use the following information for determining sound intensity. The level of sound \(\beta,\) in decibels, with an intensity of \(I,\) is given by \(\beta=10 \log \left(I I_{0}\right),\) where \(I_{0}\) is an intensity of \(10^{-12}\) watt per square meter, corresponding roughly to the faintest sound that can be heard by the human ear. In Exercises 47 and \(48,\) find the level of sound \(\beta .\) (a) \(I=10^{-10}\) watt per \(\mathrm{m}^{2}\) (quiet room) (b) \(I=10^{-5}\) watt per \(\mathrm{m}^{2}\) (busy street corner) (c) \(I=10^{-8}\) watt per \(\mathrm{m}^{2}\) (quiet radio) (d) \(I=10^{0}\) watt per \(\mathrm{m}^{2}\) (threshold of pain)

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