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Ch. 3 - Polynomial and Rational Functions
Blitzer - College Algebra 8th Edition
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Tutti i libri di testoBlitzer 8th EditionCh. 3 - Polynomial and Rational FunctionsProblema 1
Capitolo 4, Problema 1

Use the Rational Zero Theorem to list all possible rational zeros for each given function. f(x)=x3+x2−4x−4

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Identify the polynomial function: \(f(x) = x^{3} + x^{2} - 4x - 4\).
List the constant term and the leading coefficient: The constant term is \(-4\), and the leading coefficient is \(1\).
Find all factors of the constant term \(-4\): These are \(\pm 1, \pm 2, \pm 4\).
Find all factors of the leading coefficient \(1\): These are \(\pm 1\).
Use the Rational Zero Theorem to form all possible rational zeros by taking each factor of the constant term over each factor of the leading coefficient, resulting in \(\pm 1, \pm 2, \pm 4\).

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Rational Zero Theorem

The Rational Zero Theorem provides a list of all possible rational zeros of a polynomial function. It states that any rational zero, expressed as a fraction p/q in lowest terms, must have p as a factor of the constant term and q as a factor of the leading coefficient.
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Rationalizing Denominators

Factors of Integers

To apply the Rational Zero Theorem, you must find all factors of the constant term and the leading coefficient. Factors are integers that divide the number without leaving a remainder, and these factors help generate possible rational zeros by forming fractions p/q.
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Factor by Grouping

Polynomial Functions and Degree

Understanding the structure of polynomial functions, including the degree and coefficients, is essential. The degree indicates the highest power of x, which affects the number of possible zeros, while coefficients determine the factors used in the Rational Zero Theorem.
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Introduction to Polynomial Functions
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