Textbook Question
In Exercises 103–114, factor completely. (x+y)4−100(x+y)2
Ch. P - Fundamental Concepts of Algebra
Blitzer8th EditionCollege AlgebraISBN: 9780136970514
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Table of contents
- Ch. P - Fundamental Concepts of Algebra311
- Ch. 1 - Equations and Inequalities398
- Ch. 2 - Functions and Graphs407
- Ch. 3 - Polynomial and Rational Functions306
- Ch. 4 - Exponential and Logarithmic Functions247
- Ch. 5 - Systems of Equations and Inequalities173
- Ch. 6 - Matrices and Determinants143
- Ch. 7 - Conic Sections124
- Ch. 8 - Sequences, Induction, and Probability251
Chapter 1, Problem 114
Multiply or divide as indicated. [(x^2-5x-24)/(x^2-x-12)]/[(x^2-10x+16)/(x^2+x-6)]
Verified step by step guidance1
Rewrite the division of fractions as multiplication by the reciprocal. This means the problem becomes: [(x^2 - 5x - 24) / (x^2 - x - 12)] * [(x^2 + x - 6) / (x^2 - 10x + 16)].
Factorize each quadratic expression in the numerators and denominators. For example, factorize x^2 - 5x - 24 into (x - 8)(x + 3), x^2 - x - 12 into (x - 4)(x + 3), x^2 + x - 6 into (x - 2)(x + 3), and x^2 - 10x + 16 into (x - 8)(x - 2).
Substitute the factored forms back into the expression. The problem now looks like: [(x - 8)(x + 3) / (x - 4)(x + 3)] * [(x - 2)(x + 3) / (x - 8)(x - 2)].
Simplify the expression by canceling out common factors in the numerators and denominators. For instance, cancel (x + 3), (x - 8), and (x - 2) where applicable.
After canceling, multiply the remaining terms in the numerators and denominators to get the simplified expression. Ensure no further simplifications are possible.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Factoring Polynomials
Factoring polynomials involves rewriting a polynomial expression as a product of its factors. This is essential for simplifying rational expressions, as it allows for the cancellation of common terms. For example, the polynomial x^2 - 5x - 24 can be factored into (x - 8)(x + 3), making it easier to work with in division or multiplication.
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Introduction to Factoring Polynomials
Rational Expressions
A rational expression is a fraction where both the numerator and the denominator are polynomials. Understanding how to manipulate these expressions, including multiplying and dividing them, is crucial in algebra. When dividing rational expressions, one can multiply by the reciprocal of the divisor, which simplifies the process of finding the result.
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Simplifying Complex Fractions
Simplifying complex fractions involves reducing fractions that contain other fractions in their numerators or denominators. This process often requires finding a common denominator and can include factoring and canceling terms. Mastery of this concept is vital for solving problems that involve multiple layers of fractions, as seen in the given question.
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Related Practice
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