- Simple And Complex Fractions
- The Combine-Divide Method
- The LCD-Multiply-Divide Method

Inside Collection (Textbook): Elementary Algebra

Summary:

This module is from Elementary Algebra by Denny Burzynski and Wade Ellis, Jr.

A detailed study of arithmetic operations with rational expressions is presented in this chapter, beginning with the definition of a rational expression and then proceeding immediately to a discussion of the domain. The process of reducing a rational expression and illustrations of multiplying, dividing, adding, and subtracting rational expressions are also included. Since the operations of addition and subtraction can cause the most difficulty, they are given particular attention. We have tried to make the written explanation of the examples clearer by using a "freeze frame" approach, which walks the student through the operation step by step.

The five-step method of solving applied problems is included in this chapter to show the problem-solving approach to number problems, work problems, and geometry problems. The chapter also illustrates simplification of complex rational expressions, using the combine-divide method and the LCD-multiply-divide method.

Objectives of this module: be able to distinguish between simple and complex fractions, be able to simplify complex fractions using the combine-divide and the LCD-multiply-divide method.

- Simple And Complex Fractions
- The Combine-Divide Method
- The LCD-Multiply-Divide Method

In Section (Reference) we saw that a simple fraction was a fraction of the form

A complex fraction is a fraction in which the numerator or denominator, or both, is a fraction. The fractions

There are two methods for simplifying complex rational expressions: the combine-divide method and the LCD-multiply-divide method.

- If necessary, combine the terms of the numerator together.
- If necessary, combine the terms of the denominator together.
- Divide the numerator by the denominator.

Simplify each complex rational expression.

Use the combine-divide method to simplify each expression.

- Find the LCD of all the terms.
- Multiply the numerator and denominator by the LCD.
- Reduce if necessary.

Simplify each complex fraction.

The following problems are the same problems as the problems in Practice Set A. Simplify these expressions using the LCD-multiply-divide method. Compare the answers to the answers produced in Practice Set A.

For the following problems, simplify each complex rational expression.

In electricity theory, when two resistors of resistance

Write this complex fraction as a simple fraction.

According to Einstein’s theory of relativity, two velocities

Write this complex fraction as a simple fraction.

Einstein's formula is really only applicale for velocities near the speed of light

*((Reference))*
Supply the missing word. Absolute value speaks to the question of how

and not “which way.”

*((Reference))* Find the product.

*((Reference))* Factor

*((Reference))* Solve the equation

*((Reference))* One inlet pipe can fill a tank in 10 minutes. Another inlet pipe can fill the same tank in 4 minutes. How long does it take both pipes working together to fill the tank?

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Comments:"Reviewer's Comments: 'I recommend this book for courses in elementary algebra. The chapters are fairly clear and comprehensible, making them quite readable. The authors do a particularly nice job […]"