NewQMaths Brodie Swift Ross Stephen






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New QMaths 11B

3rd Edition Ross Brodie

Stephen Swift

Publishing editor: Kirstie Pickett Developmental editor: Roger Walter

Editor: Anna Beth McCormack

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© 2008 R Brodie, S Swift

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National Library of Australia Cataloguing-in-Publication Data

Ross Brodie, Stephen Swift New QMaths 11B

For secondary school age.

ISBN 9780170136570

Mathematics - Textbooks. 510

Cengage Learning Australia

Level 7, 80 Dorcas Street

South Melbourne, Victoria Australia 3205

Cengage Learning New Zealand

Unit 4B Rosedale Office Park

331 Rosedale Road, Albany, North Shore 0632, NZ

For learning solutions, visit

Printed in China by C&C Offset Printing Co Ltd.

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Introduction vi

Symbols and abbreviations



Triangle applications


1.1 Using right-angled triangles 2

1.2 Applying directions and bearings 9

1.3 The sine rule 12

1.4 The cosine rule 16

1.5 Trig applications 20

1.6 Working in three dimensions 28

Chapter summary 34

Chapter review 35


Working with data


2.1 Collecting statistical data 38

2.2 Organising and displaying information 51 2.3 Finding data positions and centres 63

2.4 Measuring spread 73

2.5 Analysing data 79

Chapter summary 87

Chapter review 89


Straight line functions


3.1 Review of linear equations 94

3.2 Functions and relations 102

3.3 Sequences and progressions 109

3.4 Gradient and intercepts of a linear function 117 3.5 Equations of linear functions 126

3.6 Distances and midpoints 138

3.7 Finding simultaneous solutions of linear functions 143

Chapter summary 149

Chapter review 151


Waves and functions


4.1 Features of periodic functions 156 4.2 Predictions using periodic functions 162 4.3 Models of periodic functions 166

Chapter summary 170

Chapter review 171

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iv New QMaths 11B


Gradients of curves


5.1 Finding average rates of change 174 5.2 Finding instantaneous rates of change 188 5.3 Practical applications of rates of change 194 5.4 Mathematical applications of rates of change 199

Chapter summary 208

Chapter review 210


Parabolic functions


6.1 Solving quadratic equations 216 6.2 Algebraic solution of quadratics 223 6.3 Sketching quadratic functions 232 6.4 Finding simultaneous solutions 241

Chapter summary 246

Chapter review 247


Differential calculus


7.1 Finding derivatives as limits 252 7.2 Rules for fi nding derivatives 263 7.3 Practical applications of derivatives 271 7.4 Mathematical applications of derivatives 276

Chapter summary 285

Chapter review 286


Applying trigonometric functions


8.1 Degrees and radians 290

8.2 Trigonometric ratios and the unit circle 295

8.3 Trigonometric graphs 306

8.4 Trigonometric functions and applications 309

Chapter summary 320

Chapter review 322


Growth, decay and logarithms


9.1 Exponential functions 326

9.2 Solving exponential equations 340

9.3 Logarithms 346

9.4 Modelling using exponential functions 350

Chapter summary 354

Chapter review 355

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Chapter Review

v Contents


Working with probability


10.1 Review of probability 360

10.2 Finding probabilities 367

10.3 Using binomial probability 374

Chapter summary 381

Chapter review 382


Reversing derivatives


11.1 Finding indefi nite integrals 386 11.2 Graphing indefi nite integrals 390 11.3 Applying indefi nite integrals 393

Chapter summary 396

Chapter review 397





Index 438

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vi New QMaths 11B


The New QMaths B textbooks are designed to assist students to build competence in the advanced computational and algebraic methods and procedures they need for further study and lifelong learning, to increase mathematical modelling and problem-solving skills, and to provide a basis for sound mathematical arguments and decisions. Students are encouraged to further develop key competencies in contexts that arise naturally from the general objectives and learning experiences of the subject.

New QMaths 11B provides ample opportunity for students to develop skills and demonstrate performance in the dimensions of communication and justifi cation, knowledge and procedures, use of technology, use of mathematical instruments and modelling and problem solving. It is a gender-inclusive and culturally inclusive text that accommodates a variety of student learning styles through a modern approach that will engage students and provide impetus for the affective objectives of the Mathematics B syllabus. The Mathematics B texts are sequenced to allow for the systematic development of mathematical concepts through the course and are designed to complement the sequencing in the New QMaths C textbooks for those students studying both subjects.

The New QMaths B textbooks provide considerable support for the use of appropriate technologies and application of concepts in a variety of situations from life-related to purely abstract tasks. Students are provided with opportunities to demonstrate initiative and there is variation from simple, single-step tasks to ones that are complex in nature.

What you will fi nd in

New QMaths 11B

and the CD-ROM

The textbook includes:

■ modern full-colour layout to help you to distinguish between examples, exercises, defi nitions and investigations

■ clear defi nitions and explanations of important terms and methods

■ artwork, photographs and maps in colour for maximum clarity and appeal

■ new content and exercises to improve development of concepts and skills

■ extensive explanations to help you to get the most from graphics calculators

■ detailed instructions in the text for the Casio and Texas Instruments graphics calculators and on the CD-ROM for the Sharp graphics calculator; the authors have assumed that calculators are in default settings—different results may be obtained if this is not the case

■ explanations of the use of spreadsheets and other technology

■ modelling and problem-solving practice within exercises to develop concepts beyond basic knowledge and procedures

■ a chapter summary and chapter review at the end of each chapter to assist in revision for end-of-term and end-of-semester assessment; the review questions are labelled to indicate the exercises where concepts were introduced

■ a clear linkage from the text to the syllabus at the beginning of each chapter.

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vii Introduction

The CD-ROM includes:

The entire student text with hot-link icons from the text to the additional features shown below.

■ Additional exercises (with answers) for every exercise to give opportunities for extra practice of concepts

■ Graphics calculator programs in downloadable form

■ Graphics calculator instructions for the Sharp graphics calculator

■ Extra material as background or extension for interested students and their teachers

■ Alternative solutions to some examples

■ Detailed proofs of important theorems

■ Spreadsheets for investigations and exercises, including interactive spreadsheets

■ A complete syllabus guide for Years 11 and 12 with appropriate sections linked to chapter openings

■ Teacher notes and copy masters

■ Hot-links from individual review questions back to the exercise where the concept was introduced

■ An extensive glossary explaining important terms with examples

Additional Exercise

Calculator Program

Extra Material


Syllabus Guide

Chapter 3.0

Ex 3.11 Teacher Notes

Calculator Instructions

Alternative Method

Detailed Proof

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viii New QMaths 11B

Symbols and abbreviations

While every effort has been made to ensure that calculator instructions are accurate, results may vary when graphics calculators are not set in default mode or as a result of manufacturers’ changes.

= is equal to

≠ is not equal to

≈ is approximately equal to

√ square root % percentage

⬍ is less than

⬎ is greater than

⭐ is less than or equal to

⭓ is greater than or equal to

⫾ plus or minus

兺 summation

Q3 3rd quartile

P87 87th percentile

D4 4th decile

1 : 650 000 at a scale of 1 to 650 000

π pi (approximately 3.141 592 7) 52°15′42′′ 52 degrees 15 minutes 42 seconds

∠ angle

䉭 triangle

x mean of x values

σ standard deviation 5 : 8 ratio of 5 to 8 / per

157°M magnetic bearing of 157° 123°T true bearing of 123° LHS left-hand side RHS right-hand side

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