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  • SCHAUMS Easy OUTLINES

    PRECALCULUS

  • Other Books in SchaumsEasy Outlines Series Include:

    Schaums Easy Outlines: College MathematicsSchaums Easy Outlines: College AlgebraSchaums Easy Outlines: CalculusSchaums Easy Outlines: Elementary AlgebraSchaums Easy Outlines: Mathematical Handbook

    of Formulas and TablesSchaums Easy Outlines: GeometrySchaums Easy Outlines: TrigonometrySchaums Easy Outlines: Probability and StatisticsSchaums Easy Outlines: StatisticsSchaums Easy Outlines: Principles of AccountingSchaums Easy Outlines: BiologySchaums Easy Outlines: College ChemistrySchaums Easy Outlines: GeneticsSchaums Easy Outlines: Human Anatomy

    and PhysiologySchaums Easy Outlines: Organic ChemistrySchaums Easy Outlines: PhysicsSchaums Easy Outlines: Basic ElectricitySchaums Easy Outlines: Programming with C++Schaums Easy Outlines: Programming with JavaSchaums Easy Outlines: FrenchSchaums Easy Outlines: German Schaums Easy Outlines: SpanishSchaums Easy Outlines: Writing and Grammar

  • SCHAUMS Easy OUTLINES

    PRECALCULUS

    B a s e d o n S c h a u m s Out l ine o f

    Precalcu lus

    b y F r e d S a f i e r

    A b r i d g e m e n t E d i t o r :

    K i m b e r ly S . K i r k p a t r i c k

    S C H AU M S O U T L I N E S E R I E SM c G R AW - H I L L

    New York Chicago San Francisco Lisbon London Madrid

    Mexico City Milan New Delhi San Juan

    Seoul Singapore Sydney Toronto

  • Copyright 2002 by The McGraw-Hill Companies, Inc. All rights reserved. Manufactured in theUnited States of America. Except as permitted under the United States Copyright Act of 1976, no partof this publication may be reproduced or distributed in any form or by any means, or stored in a data-base or retrieval system, without the prior written permission of the publisher.

    0-07-139840-6

    The material in this eBook also appears in the print version of this title: 0-07-138340-9

    All trademarks are trademarks of their respective owners. Rather than put a trademark symbol afterevery occurrence of a trademarked name, we use names in an editorial fashion only, and to the benefitof the trademark owner, with no intention of infringement of the trademark. Where such designationsappear in this book, they have been printed with initial caps.

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    TERMS OF USEThis is a copyrighted work and The McGraw-Hill Companies, Inc. (McGraw-Hill) and its licensorsreserve all rights in and to the work. Use of this work is subject to these terms. Except as permittedunder the Copyright Act of 1976 and the right to store and retrieve one copy of the work, you may notdecompile, disassemble, reverse engineer, reproduce, modify, create derivative works based upon,transmit, distribute, disseminate, sell, publish or sublicense the work or any part of it withoutMcGraw-Hills prior consent. You may use the work for your own noncommercial and personal use;any other use of the work is strictly prohibited. Your right to use the work may be terminated if youfail to comply with these terms.

    THE WORK IS PROVIDED AS IS. McGRAW-HILL AND ITS LICENSORS MAKE NO GUAR-ANTEES OR WARRANTIES AS TO THE ACCURACY, ADEQUACY OR COMPLETENESS OFOR RESULTS TO BE OBTAINED FROM USING THE WORK, INCLUDING ANY INFORMA-TION THAT CAN BE ACCESSED THROUGH THE WORK VIA HYPERLINK OR OTHERWISE,AND EXPRESSLY DISCLAIM ANY WARRANTY, EXPRESS OR IMPLIED, INCLUDING BUTNOT LIMITED TO IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR APARTICULAR PURPOSE. McGraw-Hill and its licensors do not warrant or guarantee that the func-tions contained in the work will meet your requirements or that its operation will be uninterrupted orerror free. Neither McGraw-Hill nor its licensors shall be liable to you or anyone else for any inac-curacy, error or omission, regardless of cause, in the work or for any damages resulting therefrom.McGraw-Hill has no responsibility for the content of any information accessed through the work.Under no circumstances shall McGraw-Hill and/or its licensors be liable for any indirect, incidental,special, punitive, consequential or similar damages that result from the use of or inability to use thework, even if any of them has been advised of the possibility of such damages. This limitation of lia-bility shall apply to any claim or cause whatsoever whether such claim or cause arises in contract, tortor otherwise.

    DOI: 10.1036/0071398406

  • Contents

    Chapter 1 Number Systems, Polynomials, and Exponents 1

    Chapter 2 Equations and Inequalities 13Chapter 3 Systems of Equations and

    Partial Fractions 27Chapter 4 Analytic Geometry and Functions 39Chapter 5 Algebraic Functions and

    Their Graphs 54Chapter 6 Exponential and

    Logarithmic Functions 71Chapter 7 Conic Sections 78Chapter 8 Trigonometric Functions 87Chapter 9 Trigonometric Identities and

    Trigonometric Inverses 104Chapter 10 Sequences and Series 116Index 121

    v

    For more information about this title, click here.

    Copyright 2002 by the Mcgraw-Hill Companies, Inc. Click Here for Terms of Use.

  • This page intentionally left blank.

  • Chapter 1

    Number Systems,Polynomials,

    and Exponents

    In This Chapter:

    Sets of Numbers Axioms for the Real Number System Properties of Inequalities Absolute Value Complex Numbers Order of Operations Polynomials Factoring Exponents Rational and Radical Expressions

    Sets of Numbers

    The sets of numbers used in algebra are, in general, subsets of R, the setof real numbers.

    Natural numbers N: The counting numbers, e.g., 1, 2, 3, Integers Z: The counting numbers, together with their opposites

    and 0, e.g., 0, 1, 2, 3, , 1, 2, 3

    1Copyright 2002 by the Mcgraw-Hill Companies, Inc. Click Here for Terms of Use.

  • Rational Numbers Q: The set of all numbers that can be writtenas quotients a/b, b 0, a and b integers, e.g., 3/17, 5/13,

    Irrational Numbers H: All real numbers that are not rationalnumbers, e.g., , /3,

    Example 1.1: The number 5 is a member of thesets Z, Q, R. The number 156.73 is a member of thesets Q, R. The number 5 is a member of the sets H, R.

    Axioms for the Real Number System

    There are two fundamental operations, addition and multiplication, whichhave the following properties (a, b, c arbitrary real numbers):

    Commutative Laws :a + b = b + a: order does not matter in addition.ab = ba: order does not matter in multiplication.

    Associative Laws:a + (b + c) = (a + b) + c: grouping does not matter in repeated addition.a(bc) = (ab)c: grouping does not matter in repeated multi-plication.

    Distributive Laws:a(b + c) = ab + ac; also (a + b)c = ac + bc: multiplication isdistributive over addition.

    Zero Factor Laws:For every real number a, a 0 = 0.If ab = 0, then either a = 0 or b = 0.

    Laws for Negatives: ( a) = a( a)( b) = ab ab = ( a)b = a( b) = ( a)( b) = (ab)( 1)a = a

    Laws for Quotients:

    = =

    =

    =

    = =

    a

    b

    a

    b

    a

    b

    a

    ba

    b

    a

    ba

    b

    c

    dad bcif and only if .

    2 53, ,

    2 PRECALCULUS

  • Properties of Inequalities

    The number a is less than b, written a < b, if b a is positive. If a < b thenb is greater than a, written b > a. If a is either less than or equal to b, thisis written a b. If a b then b is greater than or equal to a, written b a.The following properties may be deduced from these definitions:

    If a < b, then a + c < b + c.

    If a < b, then.

    If a < b and b < c, then a < c.

    Absolute Value

    The absolute value of a real number a, written a, is defined as follows:

    .

    Complex Numbers

    Not all numbers are real numbers. The set of complex numbers, C, con-tains all numbers of the standard form a + bi, where a and b are real andi2 = 1. Since every real number x can be written as x + 0i, it follows thatevery real number is also a complex number. The complex numbers thatare not real are sometimes known as imaginary numbers.

    Example 1.2: are examples of

    complex (imaginary) numbers.

    In standard form, complex numbers can be combined using the op-erations defined for real numbers, together with the definition of theimaginary unit i: i2 = 1. The conjugate of a complex number z is denot-ed z. If z = a + bi, then z = a bi.

    3 4 3 2 5 21

    2

    3

    2+ = + +i i i i, , ,

    aa a

    a a=

    > 0, x1/n is the positive real number y which, when

    raised to the nth power gives x.

    3 2 3 31

    21

    3

    1 3 2

    32 4 4 5 2

    24

    4 52

    4

    2

    2

    4 5x y x y z xy

    x yz

    y

    x

    z

    x y + = + = +( )

    ( ) ( )

    xx

    nn

    = 1

    a b a b a b

    a b

    a ab b a b

    a ab b a b

    2 2

    2 2

    2 2 2

    2 2 2

    2

    2

    = + ++ + = + + =

    ( )( )

    ( )

    ( )

    Difference of two squares

    is prime. Sum of two squares

    Square of a sum

    Square of a difference

    8 PRECALCULUS

  • if x = 0, x1/n = 0. if x < 0, x1/n is not a real number.

    Remember

    Even roots of negative numbersare not real numbers.

    Example 1.18: (a) 161/4 = 2; (b) 161/4 = (16)1/4 = 2; (c) ( 16)1/4is not a real number; (d ) ( 8)1/3 = 2

    xm/n is defined by: xm/n = (x1/n)m = (xm)1/n, provided x1/n is real.

    Example 1.19: (a) , (b) ( 64)5/6 is nota real number.

    Laws of exponents for a and b rational nu

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