Algebra and Trigonometry: Structure and Method, Book 2

2000th Edition

ISBN: 9780395977255

Author: MCDOUGAL LITTEL

Publisher: McDougal Littell

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Concept explainers

Percentage

A percentage is a number indicated as a fraction of 100. It is a dimensionless number often expressed using the symbol %.

Algebraic Expressions

In mathematics, an algebraic expression consists of constant(s), variable(s), and mathematical operators. It is made up of terms.

Numbers

Numbers are some measures used for counting. They can be compared one with another to know its position in the number line and determine which one is greater or lesser than the other.

Subtraction

Before we begin to understand the subtraction of algebraic expressions, we need to list out a few things that form the basis of algebra.

Addition

Before we begin to understand the addition of algebraic expressions, we need to list out a few things that form the basis of algebra.

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Question

Chapter 5.7, Problem 19WE

To determine

To simplify the given expression.

Expert Solution & Answer

Answer to Problem 19WE

−a

Explanation of Solution

Given:

Expression: 1a+1+1a−11a+1−1a−1

Concept used:

To simplify the given expression:

Find the Least Common Multiple of the fraction and write in reduced form.
Take out common terms in the given expression.
Cancel out the terms that are in common in numerator and the denominator.
Find if any algebraic identities can simplify the given expression.

Formula Used:

a−1=1a

Calculation:

Using the above concept,

⇒1a+1+1a−11a+1−1a−1

Consider the numerator and simplify,

⇒1a+1+1a−1

Least Common Multiple of (a+1,a−1) is (a+1)(a−1) .

⇒1(a+1)+1(a−1)⇒1×(a−1)(a+1)×(a−1)+1×(a+1)(a−1)×(a+1)⇒(a−1)(a+1)(a−1)+(a+1)(a−1)(a+1)⇒(a−1)+(a+1)(a+1)(a−1)⇒(a−1+a+1)(a+1)(a−1)⇒2a(a+1)(a−1)

Consider the denominator and simplify,

⇒1a+1−1a−1

Least Common Multiple of (a+1,a−1) is (a+1)(a−1) .

⇒1(a+1)−1(a−1)⇒1×(a−1)(a+1)×(a−1)−1×(a+1)(a−1)×(a+1)⇒(a−1)(a+1)(a−1)−(a+1)(a−1)(a+1)⇒(a−1)−(a+1)(a+1)(a−1)⇒(a−1−a−1)(a+1)(a−1)⇒−2(a+1)(a−1)

Substituting in the given expression,

⇒2a(a+1)(a−1)−2(a+1)(a−1)⇒2a((a+1)(a−1))−2((a+1)(a−1))⇒2a((a+1)(a−1))−2((a+1)(a−1))⇒2a−2⇒2a−2⇒−a

Conclusion:

Therefore, the simplified form of the expression is −a.

Chapter 5.7, Problem 18WE

Chapter 5.7, Problem 20WE

Chapter 5 Solutions

Algebra and Trigonometry: Structure and Method, Book 2

Ch. 5.1 - Prob. 1OE Ch. 5.1 - Prob. 2OE Ch. 5.1 - Prob. 3OE Ch. 5.1 - Prob. 4OE Ch. 5.1 - Prob. 5OE Ch. 5.1 - Prob. 6OE Ch. 5.1 - Prob. 7OE Ch. 5.1 - Prob. 8OE Ch. 5.1 - Prob. 9OE Ch. 5.1 - Prob. 10OE

Ch. 5.1 - Prob. 11OE Ch. 5.1 - Prob. 12OE Ch. 5.1 - Prob. 1WE Ch. 5.1 - Prob. 2WE Ch. 5.1 - Prob. 3WE Ch. 5.1 - Prob. 4WE Ch. 5.1 - Prob. 5WE Ch. 5.1 - Prob. 6WE Ch. 5.1 - Prob. 7WE Ch. 5.1 - Prob. 8WE Ch. 5.1 - Prob. 9WE Ch. 5.1 - Prob. 10WE Ch. 5.1 - Prob. 11WE Ch. 5.1 - Prob. 12WE Ch. 5.1 - Prob. 13WE Ch. 5.1 - Prob. 14WE Ch. 5.1 - Prob. 15WE Ch. 5.1 - Prob. 16WE Ch. 5.1 - Prob. 17WE Ch. 5.1 - Prob. 18WE Ch. 5.1 - Prob. 19WE Ch. 5.1 - Prob. 20WE Ch. 5.1 - Prob. 21WE Ch. 5.1 - Prob. 22WE Ch. 5.1 - Prob. 23WE Ch. 5.1 - Prob. 24WE Ch. 5.1 - Prob. 25WE Ch. 5.1 - Prob. 26WE Ch. 5.1 - Prob. 27WE Ch. 5.1 - Prob. 28WE Ch. 5.1 - Prob. 29WE Ch. 5.1 - Prob. 30WE Ch. 5.1 - Prob. 31WE Ch. 5.1 - Prob. 32WE Ch. 5.1 - Prob. 33WE Ch. 5.1 - Prob. 34WE Ch. 5.1 - Prob. 35WE Ch. 5.1 - Prob. 36WE Ch. 5.1 - Prob. 1MRE Ch. 5.1 - Prob. 2MRE Ch. 5.1 - Prob. 3MRE Ch. 5.1 - Prob. 4MRE Ch. 5.1 - Prob. 5MRE Ch. 5.1 - Prob. 6MRE Ch. 5.1 - Prob. 7MRE Ch. 5.1 - Prob. 8MRE Ch. 5.1 - Prob. 9MRE Ch. 5.1 - Prob. 10MRE Ch. 5.1 - 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Prob. 9WE Ch. 5.3 - Prob. 10WE Ch. 5.3 - Prob. 11WE Ch. 5.3 - Prob. 12WE Ch. 5.3 - Prob. 13WE Ch. 5.3 - Prob. 14WE Ch. 5.3 - Prob. 15WE Ch. 5.3 - Prob. 16WE Ch. 5.3 - Prob. 17WE Ch. 5.3 - Prob. 18WE Ch. 5.3 - Prob. 19WE Ch. 5.3 - Prob. 20WE Ch. 5.3 - Prob. 21WE Ch. 5.3 - Prob. 22WE Ch. 5.3 - Prob. 23WE Ch. 5.3 - Prob. 24WE Ch. 5.3 - Prob. 25WE Ch. 5.3 - Prob. 26WE Ch. 5.3 - Prob. 27WE Ch. 5.3 - Prob. 28WE Ch. 5.3 - Prob. 29WE Ch. 5.3 - Prob. 30WE Ch. 5.3 - Prob. 31WE Ch. 5.3 - Prob. 1P Ch. 5.3 - Prob. 2P Ch. 5.3 - Prob. 3P Ch. 5.3 - Prob. 4P Ch. 5.3 - Prob. 5P Ch. 5.3 - Prob. 6P Ch. 5.3 - Prob. 7P Ch. 5.3 - Prob. 8P Ch. 5.3 - Prob. 9P Ch. 5.3 - Prob. 10P Ch. 5.3 - Prob. 11P Ch. 5.3 - Prob. 12P Ch. 5.3 - Prob. 13P Ch. 5.3 - Prob. 14P Ch. 5.3 - Prob. 15P Ch. 5.3 - Prob. 1MRE Ch. 5.3 - Prob. 2MRE Ch. 5.3 - Prob. 3MRE Ch. 5.3 - Prob. 4MRE Ch. 5.3 - Prob. 5MRE Ch. 5.3 - Prob. 6MRE Ch. 5.3 - Prob. 7MRE Ch. 5.3 - Prob. 8MRE Ch. 5.3 - Prob. 9MRE Ch. 5.3 - Prob. 10MRE Ch. 5.3 - Prob. 11MRE Ch. 5.3 - 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