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How does the linear factorization of \(f(x)\), that is, $$f(x)=a_{n}\left(x-c_{1}\right)\left(x-c_{2}\right) \cdots\left(x-c_{n}\right)$$ show that a polynomial equation of degree \(n\) has \(n\) roots?

Short Answer

Expert verified
The linear factorization of a polynomial expresses it as a product of linear factors, each representing a root of the polynomial. Therefore, in the case of a polynomial of degree \(n\), it has \(n\) linear factors and correspondingly \(n\) roots.

Step by step solution

01

Understand the linear factorization of a polynomial

In the linear factorization of a polynomial \(f(x)\), \(a_n\) is the leading coefficient and each of the \(c_i\) values (with \(i\) ranging from 1 to \(n\)) are the roots of the polynomial. This means that when we substitute \(x = c_i\) into the equation \(f(x)\), the result will be zero. Hence, the polynomial is expressed as a product of linear factors which are obtained by equating each factor to zero.
02

Relate roots to linear factors

Each linear factor \(x - c_i\) represents a root of the polynomial at \(x = c_i\). Hence, the number of linear factors in the representation of the polynomial directly indicates the number of roots of the equation.
03

Count the number of roots

Given that the polynomial is of degree \(n\), and in its factorized form, it comprises \(n\) linear factors hence, it must necessarily have \(n\) roots. This completes the argument that a polynomial equation of degree \(n\) has \(n\) roots.

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Key Concepts

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

Linear Factorization
Linear factorization is the process of breaking down a polynomial into simpler components called linear factors, each representing a solution or root of the polynomial. The roots are the values of x for which the polynomial equation equals zero. For example, if a polynomial has a root at x = 3, then it can be said that \(x-3\) is a linear factor of the polynomial.

The term 'linear' in linear factorization refers to the fact that each factor is a linear equation of the form \(x-c\), where \(c\) is a constant value. When a polynomial is completely factored into linear components, it's said to be in its simplest form. This simplification is vital because it makes the polynomial's roots immediately apparent, as they correspond to the values of x that make each factor equal to zero.

Improving the understanding of this topic requires the realization that linear factorization not only simplifies polynomials but also makes solving various mathematical problems easier. When given a polynomial, one should aim to express it as the product of its linear factors to reveal all possible roots.
Polynomial Equation
A polynomial equation is an expression involving a polynomial set equal to another value, typically zero. The standard form of a polynomial equation is \(a_nx^n + a_{n-1}x^{n-1} + ... + a_1x + a_0 = 0\), where the \(a_i\) terms are constants, and \(x\) is a variable whose powers decrease from n down to zero. The highest power of x, denoted as n, represents the degree of the polynomial.

An essential aspect of polynomial equations is that they can have multiple solutions. The fundamental theorem of algebra states that a polynomial equation of degree n will have n roots, which could be real or complex numbers. Some roots may be repeated, but each occurrence is counted towards the overall count of n. Understanding how to find these roots is crucial for solving polynomial equations, and linear factorization is one of the key techniques used in this endeavor.

To get a better grasp on this concept, practice is essential. Try working through polynomial equations of varying degrees, and remember that factoring the polynomial is often the first step to determining the solutions.
Degree of a Polynomial
The degree of a polynomial is the highest power of the variable x that appears in the polynomial with a non-zero coefficient. It is a very straightforward but significant attribute because it reveals the maximum number of solutions—or roots—that the polynomial equation can have. This is invaluable when analyzing graphs and predicting the behavior of polynomial functions.

Polynomials are often discussed in terms of their degree because it has implications for their graph's shape, how many times it intersects the x-axis (which corresponds to the number of real roots), and the complexity of the function. The Fundamental Theorem of Algebra assures that a polynomial will have as many roots as its degree, although some roots could be complex numbers.

To cement understanding in the concept of the degree of a polynomial, it can be helpful to examine and graph polynomials of different degrees. Observe the corresponding number of x-intercepts and relate them to the polynomial's roots. By visualizing this relationship, the concept of a polynomial's degree becomes more tangible.

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Most popular questions from this chapter

An athlete whose event is the shot put releases the shot with the same initial velocity but at different angles. The figure shows the parabolic paths for shots released at angles of \(35^{\circ}\) and \(65^{\circ} .\) Exercises \(57-58\) are based on the functions that model the parabolic paths. When the shot whose path is shown by the red graph is released at an angle of \(65^{\circ},\) its height, \(g(x),\) in feet, can be modeled by $$ g(x)=-0.04 x^{2}+2.1 x+6.1 $$ where \(x\) is the shot's horizontal distance, in feet, from its point of release. Use this model to solve parts (a) through (c) and verify your answers using the red graph. a. What is the maximum height, to the nearest tenth of a foot, of the shot and how far from its point of release does this occur? b. What is the shot's maximum horizontal distance, to the nearest tenth of a foot, or the distance of the throw? c. From what height was the shot released?

Why must every polynomial equation with real coefficients of degree 3 have at least one real root?

In Exercises \(33-40,\) use synthetic division and the Remainder Theorem to find the indicated function value. $$f(x)=2 x^{4}-5 x^{3}-x^{2}+3 x+2 ; \quad f\left(-\frac{1}{2}\right)$$

During the 1980 s, the controversial economist Arthur Laffer promoted the idea that tax increases lead to a reduction in government revenue. Called supply- side economics, the theory uses functions such as $$f(x)=\frac{80 x-8000}{x-110}, 30 \leq x \leq 100$$ This function models the government tax revenue, \(f(x),\) in tens of billions of dollars, in terms of the tax rate, \(x\). The graph of the function is shown. It illustrates tax revenue decreasing quite dramatically as the tax rate increases. At a tax rate of (gasp) \(100 \%\), the government takes all our money and no one has an incentive to work. With no income earned, zero dollars in tax revenue is generated. (GRAPH CAN'T COPY). During the 1980 s, the controversial economist Arthur Laffer promoted the idea that tax increases lead to a reduction in government revenue. Called supply- side economics, the theory uses functions such as $$f(x)=\frac{80 x-8000}{x-110}, 30 \leq x \leq 100$$ This function models the government tax revenue, \(f(x),\) in tens of billions of dollars, in terms of the tax rate, \(x\). The graph of the function is shown. It illustrates tax revenue decreasing quite dramatically as the tax rate increases. At a tax rate of (gasp) \(100 \%\), the government takes all our money and no one has an incentive to work. With no income earned, zero dollars in tax revenue is generated. (GRAPH CAN'T COPY). Use function \(f\) and its graph to solve Exercises \(55-56\) a. Find and interpret \(f(30)\). Identify the solution as a point on the graph of the function. b. Rewrite the function by using long division to perform $$(80 x-8000) \div(x-110)$$ Then use this new form of the function to find \(f(30) .\) Do you obtain the same answer as you did in part (a)? c. Is \(f\) a polynomial function? Explain your answer.

An equation of a quadratic function is given. a. Determine, without graphing, whether the function has a minimum value or a maximum value. b. Find the minimum or maximum value and determine where it occurs. c. Identify the function’s domain and its range. $$f(x)=-4 x^{2}+8 x-3$$

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