Precalculus with Limits

1091 Pages·2013·227.409 MB·English

by  Ron Larson

GRAPHS OF PARENT FUNCTIONS
Linear Function Absolute Value Function Square Root Function
f(cid:2)x(cid:3)(cid:4)mx (cid:6)b f(cid:2)x(cid:3)(cid:4)(cid:10)x(cid:10)(cid:4)(cid:11)x, x (cid:5) 0 f(cid:2)x(cid:3)(cid:4)(cid:9)x
(cid:3)x, x < 0
y y y
2 4
3 f(x) = x
(0, b) 1
f(x) = ⏐x⏐
2
x x
(− b , 0 ( (− b , 0 ( −2 −1 (0, 0) 2 1
m m
−1
x
f(x) = mx + b, f(x) = mx + b, −1 (0, 0) 2 3 4
m > 0 m < 0 −2 −1
Domain:(cid:2)(cid:3)(cid:2), (cid:2)(cid:3) Domain:(cid:2)(cid:3)(cid:2), (cid:2)(cid:3) Domain:(cid:5)0, (cid:2)(cid:3)
Range:(cid:2)(cid:3)(cid:2), (cid:2)(cid:3) Range:(cid:5)0, (cid:2)(cid:3) Range:(cid:5)0, (cid:2)(cid:3)
x-intercept:(cid:2)(cid:3)b(cid:8)m, 0(cid:3) Intercept:(cid:2)0, 0(cid:3) Intercept:(cid:2)0, 0(cid:3)
y-intercept:(cid:2)0, b(cid:3) Decreasing on (cid:2)(cid:3)(cid:2), 0(cid:3) Increasing on (cid:2)0, (cid:2)(cid:3)
Increasing when m > 0 Increasing on (cid:2)0, (cid:2)(cid:3)
Decreasing when m < 0 Even function
y-axis symmetry
Greatest Integer Function Quadratic (Squaring) Function Cubic Function
f(cid:2)x(cid:3)(cid:4)(cid:6)x(cid:7) f(cid:2)x(cid:3)(cid:4)ax2 f(cid:2)x(cid:3)(cid:4)x3
y y y
f(x) = [ [ x]]
3 3 3
2 2 2
1 1 f(x) =ax2,a>0
(0, 0)
x x x
−3 −2 −1 1 2 3 −2 −1 1 2 3 4 −3 −2 1 2 3
−1 f(x) =ax2,a<0 −1 f(x) = x3
−2 −2
−3 −3 −3
Domain:(cid:2)(cid:3)(cid:2), (cid:2)(cid:3) Domain:(cid:2)(cid:3)(cid:2), (cid:2)(cid:3) Domain:(cid:2)(cid:3)(cid:2), (cid:2)(cid:3)
Range:the set of integers Range (cid:2)a > 0(cid:3):(cid:5)0, (cid:2)(cid:3) Range:(cid:2)(cid:3)(cid:2), (cid:2)(cid:3)
x-intercepts:in the interval (cid:5)0, 1(cid:3) Range (cid:2)a < 0(cid:3):(cid:2)(cid:3)(cid:2), 0(cid:4) Intercept:(cid:2)0, 0(cid:3)
y-intercept:(cid:2)0, 0(cid:3) Intercept:(cid:2)0, 0(cid:3) Increasing on (cid:2)(cid:3)(cid:2), (cid:2)(cid:3)
Constant between each pair of Decreasing on (cid:2)(cid:3)(cid:2), 0(cid:3)for a > 0 Odd function
consecutive integers Increasing on (cid:2)0, (cid:2)(cid:3)for a > 0 Origin symmetry
Jumps vertically one unit at Increasing on (cid:2)(cid:3)(cid:2), 0(cid:3)for a < 0
each integer value Decreasing on (cid:2)0, (cid:2)(cid:3)for a < 0
Even function
y-axis symmetry
Relative minimum (cid:2)a > 0(cid:3),
relative maximum (cid:2)a < 0(cid:3),
or vertex:(cid:2)0, 0(cid:3)
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Rational (Reciprocal) Function Exponential Function Logarithmic Function
1
f(cid:2)x(cid:3)(cid:4) f(cid:2)x(cid:3)(cid:4) ax, a > 1 f(cid:2)x(cid:3)(cid:4)log x, a > 1
x a
y y y
3 1
f(x) = f(x) = log x
x 1 a
2
1 f(x) = ax f(x) = a−x
(0, 1) (1, 0)
x x
−1 1 2 3 1 2
x
−1
Domain:(cid:2)(cid:3)(cid:2), 0(cid:3)(cid:2)(cid:2)0, (cid:2)) Domain:(cid:2)(cid:3)(cid:2), (cid:2)(cid:3) Domain:(cid:2)0, (cid:2)(cid:3)
Range:(cid:2)(cid:3)(cid:2), 0(cid:3)(cid:2)(cid:2)0, (cid:2)) Range:(cid:2)0, (cid:2)(cid:3) Range:(cid:2)(cid:3)(cid:2), (cid:2)(cid:3)
No intercepts Intercept:(cid:2)0, 1(cid:3) Intercept:(cid:2)1, 0(cid:3)
Decreasing on (cid:2)(cid:3)(cid:2), 0(cid:3) and (cid:2) 0, (cid:2)(cid:3) Increasing on (cid:2)(cid:3)(cid:2), (cid:2)(cid:3) Increasing on (cid:2)0, (cid:2)(cid:3)
Odd function for f(cid:2)x(cid:3)(cid:4)ax Vertical asymptote:y-axis
Origin symmetry Decreasing on (cid:2)(cid:3)(cid:2), (cid:2)(cid:3) Continuous
Vertical asymptote:y-axis for f(cid:2)x(cid:3)(cid:4)a(cid:3)x Reflection of graph of f(cid:2)x(cid:3)(cid:4)ax
Horizontal asymptote:x-axis Horizontal asymptote:x-axis in the line y(cid:4)x
Continuous
Sine Function Cosine Function Tangent Function
f(cid:2)x(cid:3)(cid:4)sin x f(cid:2)x(cid:3)(cid:4) cos x f(cid:2)x(cid:3)(cid:4)tan x
y y
y f(x) = tan x
3 3
3
f(x) = sin x f(x) = cos x
2 2
2
1
1
x x
−π 2π π 2π −π −2π 2π π 2π −π π π 3π x
2 2 2
−2 −2
−3 −3
(cid:7)
Domain:(cid:2)(cid:3)(cid:2), (cid:2)(cid:3) Domain:(cid:2)(cid:3)(cid:2), (cid:2)(cid:3) Domain:all x(cid:8) (cid:6)n(cid:7)
Range:(cid:5)(cid:3)1, 1(cid:4) Range:(cid:5)(cid:3)1, 1(cid:4) 2
Range:(cid:2)(cid:3)(cid:2), (cid:2)(cid:3)
Period:2(cid:7) Period:2(cid:7)
x-intercepts:(cid:2)n(cid:7), 0(cid:3) (cid:12)(cid:7) (cid:13) Period:(cid:7)
y-intercept:(cid:2)0, 0(cid:3) x-intercepts: 2 (cid:6)n(cid:7), 0 xy--iinntteerrcceepptt:s:(cid:2)0(cid:2)n, (cid:7)0(cid:3), 0(cid:3)
Odd function y-intercept:(cid:2)0, 1(cid:3)
Vertical asymptotes:
Origin symmetry Even function
(cid:7)
y-axis symmetry x(cid:4) (cid:6)n(cid:7)
2
Odd function
Origin symmetry
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Cosecant Function Secant Function Cotangent Function
f(cid:2)x(cid:3)(cid:4)csc x f(cid:2)x(cid:3)(cid:4)sec x f(cid:2)x(cid:3)(cid:4)cot x
1 1 1
f(x) = csc x = f(x) = sec x = f(x) = cot x =
y sin x y cos x y tan x
3 3 3
2 2 2
1 1
x x x
−π π π 2π −π −π π π 3π 2π −π −π π π 2π
2 2 2 2 2 2
−2
−3
(cid:7)
Domain:all x(cid:8)n(cid:7) Domain:all x(cid:8) (cid:6) n(cid:7) Domain:all x(cid:8)n(cid:7)
Range:(cid:2)(cid:3)(cid:2), (cid:3)1(cid:4)(cid:2)(cid:5)1, (cid:2)(cid:3) 2 Range:(cid:2)(cid:3)(cid:2), (cid:2)(cid:3)
Period:2(cid:7) Range:(cid:2)(cid:3)(cid:2), (cid:3)1(cid:4)(cid:2)(cid:5)1, (cid:2)(cid:3) Period:(cid:7)
Period:2(cid:7)
No intercepts (cid:12)(cid:7) (cid:13)
Vertical asymptotes:x(cid:4)n(cid:7) y-intercept:(cid:2)0, 1(cid:3) x-intercepts: (cid:6)n(cid:7), 0
2
Vertical asymptotes:
Odd function (cid:7) Vertical asymptotes:x(cid:4)n(cid:7)
Origin symmetry x(cid:4) (cid:6) n(cid:7) Odd function
2
Origin symmetry
Even function
y-axis symmetry
Inverse Sine Function Inverse Cosine Function Inverse Tangent Function
f(cid:2)x(cid:3)(cid:4)arcsin x f(cid:2)x(cid:3)(cid:4)arccos x f(cid:2)x(cid:3)(cid:4)arctan x
y y y
π π
π
2 2
f(x) = arccos x
x x
−1 1 −2 −1 1 2
f(x) = arcsin x f(x) = arctan x
π π
− x −
2 −1 1 2
Domain:(cid:5)(cid:3)1, 1(cid:4) Domain:(cid:5)(cid:3)1, 1(cid:4) Domain:(cid:2)(cid:3)(cid:2), (cid:2)(cid:3)
(cid:14) (cid:7) (cid:7)(cid:15) Range:(cid:5)0, (cid:7)(cid:4) (cid:12) (cid:7) (cid:7)(cid:13)
Range: (cid:3) , Range: (cid:3) ,
2 2 (cid:12) (cid:7)(cid:13) 2 2
Intercept:(cid:2)0, 0(cid:3) y-intercept: 0, 2 Intercept:(cid:2)0, 0(cid:3)
Odd function Horizontal asymptotes:
Origin symmetry (cid:7)
y(cid:4)±
2
Odd function
Origin symmetry
Copyright 2012 Cengage Learning. All Rights Reserved. May not be copied, scanned, or duplicated, in whole or in part. Due to electronic rights, some third party content may be suppressed from the eBook and/or eChapter(s). Editorial review has
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Precalculus with Limits
Third Edition
Ron Larson
The Pennsylvania State University
The Behrend College
With the assistance of David C. Falvo
The Pennsylvania State University
The Behrend College
Australia • Brazil • Japan • Korea • Mexico • Singapore • Spain • United Kingdom • United States
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deemed that any suppressed content does not materially affect the overall learning experience. Cengage Learning reserves the right to remove additional content at any time if subsequent rights restrictions require it.
Precalculus with Limits © 2014, 2011, 2007 Brooks/Cole, Cengage Learning
Third Edition
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Contents
1
Functions and Their Graphs 1
1.1 Rectangular Coordinates 2
1.2 Graphs of Equations 11
1.3 Linear Equations in Two Variables 22
1.4 Functions 35
1.5 Analyzing Graphs of Functions 49
1.6 A Library of Parent Functions 60
1.7 Transformations of Functions 67
1.8 Combinations of Functions: Composite Functions 76
1.9 Inverse Functions 84
1.10 Mathematical Modeling and Variation 93
Chapter Summary 104
Review Exercises 106
Chapter Test 109
Proofs in Mathematics 110
P.S.Problem Solving 111
2
Polynomial and Rational Functions 113
2.1 Quadratic Functions and Models 114
2.2 Polynomial Functions of Higher Degree 124
2.3 Polynomial and Synthetic Division 138
2.4 Complex Numbers 147
2.5 Zeros of Polynomial Functions 154
2.6 Rational Functions 168
2.7 Nonlinear Inequalities 180
Chapter Summary 190
Review Exercises 192
Chapter Test 194
Proofs in Mathematics 195
P.S.Problem Solving 197
3
Exponential and Logarithmic Functions 199
3.1 Exponential Functions and Their Graphs 200
3.2 Logarithmic Functions and Their Graphs 211
3.3 Properties of Logarithms 221
3.4 Exponential and Logarithmic Equations 228
3.5 Exponential and Logarithmic Models 238
Chapter Summary 250
Review Exercises 252
Chapter Test 255
Cumulative Test for Chapters 1–3 256
Proofs in Mathematics 258
P.S.Problem Solving 259
iii
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deemed that any suppressed content does not materially affect the overall learning experience. Cengage Learning reserves the right to remove additional content at any time if subsequent rights restrictions require it.
iv Contents
4
Trigonometry 261
4.1 Radian and Degree Measure 262
4.2 Trigonometric Functions: The Unit Circle 272
4.3 Right Triangle Trigonometry 279
4.4 Trigonometric Functions of Any Angle 290
4.5 Graphs of Sine and Cosine Functions 299
4.6 Graphs of Other Trigonometric Functions 310
4.7 Inverse Trigonometric Functions 320
4.8 Applications and Models 330
Chapter Summary 340
Review Exercises 342
Chapter Test 345
Proofs in Mathematics 346
P.S.Problem Solving 347
5
Analytic Trigonometry 349
5.1 Using Fundamental Identities 350
5.2 Verifying Trigonometric Identities 357
5.3 Solving Trigonometric Equations 364
5.4 Sum and Difference Formulas 375
5.5 Multiple-Angle and Product-to-Sum Formulas 382
Chapter Summary 391
Review Exercises 393
Chapter Test 395
Proofs in Mathematics 396
P.S.Problem Solving 399
6
Additional Topics in Trigonometery 401
6.1 Law of Sines 402
6.2 Law of Cosines 411
6.3 Vectors in the Plane 418
6.4 Vectors and Dot Products 431
6.5 Trigonometric Form of a Complex Number 440
Chapter Summary 450
Review Exercises 452
Chapter Test 456
Cumulative Test for Chapters 4–6 457
Proofs in Mathematics 459
P.S.Problem Solving 463
7
Systems of Equations and Inequalities 465
7.1 Linear and Nonlinear Systems of Equations 466
7.2 Two-Variable Linear Systems 476
7.3 Multivariable Linear Systems 488
7.4 Partial Fractions 500
7.5 Systems of Inequalities 508
7.6 Linear Programming 518
Chapter Summary 527
Review Exercises 529
Chapter Test 533
Proofs in Mathematics 534
P.S.Problem Solving 535
Copyright 2012 Cengage Learning. All Rights Reserved. May not be copied, scanned, or duplicated, in whole or in part. Due to electronic rights, some third party content may be suppressed from the eBook and/or eChapter(s). Editorial review has
deemed that any suppressed content does not materially affect the overall learning experience. Cengage Learning reserves the right to remove additional content at any time if subsequent rights restrictions require it.