Welcome to Precalculus, an OpenStax College resource. This textbook has been created with several goals in mind: accessibility, customization, and student engagement—all while encouraging students toward high levels of academic scholarship. Instructors and students alike will find that this textbook offers a strong foundation in precalculus in an accessible format.
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Precalculus is intended for college-level precalculus students. Since precalculus courses vary from one institution to the next, we have attempted to meet the needs of as broad an audience as possible, including all of the content that might be covered in any particular course. The result is a comprehensive book that covers more ground than an instructor could likely cover in a typical one- or two-semester course; but instructors should find, almost without fail, that the topics they wish to include in their syllabus are covered in the text.
Many chapters of Openstax College Precalculus are suitable for other freshman and sophomore math courses such as College Algebra and Trigonometry; however, instructors of those courses might need to supplement or adjust the material. Openstax will also be releasing College Algebra and Algebra and Trigonometry titles tailored to the particular scope, sequence, and pedagogy of those courses.
Coverage and Scope
Precalculus contains twelve chapters, roughly divided into three groups.
Chapters 1-4 discuss various types of functions, providing a foundation for the remainder of the course.
Chapters 5-8 focus on Trigonometry. In Precalculus, we approach trigonometry by first introducing angles and the unit circle, as opposed to the right triangle approach more commonly used in College Algebra and Trigonometry courses.
Chapters 9-12 present some advanced Precalculus topics that build on topics introduced in chapters 1-8. Most Precalculus syllabi include some of the topics in these chapters, but few include all. Instructors can select material as needed from this group of chapters, since they are not cumulative.
Openstax Precalculus is the product of a collaborative effort by a group of dedicated authors, editors, and instructors whose collective passion for this project has resulted in a text that is remarkably unified in purpose and voice. Special thanks is due to our Lead Author, Jay Abramson of Arizona State University, who provided the overall vision for the book and oversaw the development of each and every chapter, drawing up the initial blueprint, reading numerous drafts, and assimilating field reviews into actionable revision plans for our authors and editors.
The first eight chapters are a derivative work, built on the foundation of Precalculus: An Investigation of Functions, by David Lippman and Melonie Rasmussen. Chapters 9-12 were written and developed from by our expert and highly experienced author team. All twelve chapters follow a new and innovative instructional design, and great care has been taken to maintain a consistent voice from cover to cover. New features have been introduced to flesh out the instruction, all of the graphics have been re-done in a more contemporary style, and much of the content has been revised, replaced, or supplemented to bring the text more in line with mainstream approaches to teaching Precalculus.
Accuracy of the Content
We have taken great pains to ensure the validity and accuracy of this text. Each chapter’s manuscript underwent at least two rounds of review and revision by a panel of active Precalculus instructors. Then, prior to publication, a separate team of experts checked all text, examples, and graphics for mathematical accuracy; multiple reviewers were assigned to each chapter to minimize the chances of any error escaping notice. A third team of experts was responsible for the accuracy of the Answer Key, dutifully re-working every solution to eradicate any lingering errors. Finally, the editorial team conducted a multi-round post-production review to ensure the integrity of the content in its final form. The Solutions Manual, which was written and developed after the Student Edition, has also been rigorously checked for accuracy following a process similar to that described above. Incidentally, the act of writing out solutions step-by-step served as yet another round of validation for the Answer Key in the back of the Student Edition.
In spite of the efforts described above, we acknowledge the possibility that—as with any textbook—some errata have slipped past the guards. We encourage users to report errors via our Errata page.
Pedagogical Foundations and Features
Each chapter is divided into multiple sections (or modules), each of which is organized around a set of learning objectives. The learning objectives are listed explicitly at the beginning of each section, and are the focal point of every instructional element
Narrative text is used to introduce key concepts, terms, and definitions, to provide real-world context, and to provide transitions between topics and examples. Throughout this book, we rely on a few basic conventions to highlight the most important ideas:
Each learning objective is supported by one or more worked examples, which demonstrate the problem-solving approaches that students must master. Typically, we include multiple Examples for each learning objective in order to model different approaches to the same type of problem, or to introduce similar problems of increasing complexity. All told, there are more than 650 Examples, or an average of about 55 per chapter.
All Examples follow a simple two- or three-part format. First, we pose a problem or question. Next, we demonstrate the Solution, spelling out the steps along the way. Finally (for select Examples), we conclude with an Analysis reflecting on the broader implications of the Solution just shown.
Openstax Precalculus contains more than 2000 figures and illustrations, the vast majority of which are graphs and diagrams. Art throughout the text adheres to a clear, understated style, drawing the eye to the most important information in each figure while minimizing visual distractions. Color contrast is employed with discretion to distinguish between the different functions or features of a graph.
Four small but important features, each marked by a distinctive icon, serve to support Examples.
A “How To” is a list of steps necessary to solve a certain type of problem. A How To typically precedes an Example that proceeds to demonstrate the steps in action.
A “Try It” exercise immediately follows an Example or a set of related Examples, providing the student with an immediate opportunity to solve a similar problem. In the Online version of the text, students can click an Answer link directly below the question to check their understanding. In other versions, answers to the Try-It exercises are located in the Answer Key.
A Q&A may appear at any point in the narrative, but most often follows an Example. This feature pre-empts misconceptions by posing a commonly asked yes/no question, followed by a detailed answer and explanation.
The “Media” icon appears at the conclusion of each section, just prior to the Section Exercises. This icon marks a list of links to online video tutorials that reinforce the concepts and skills introduced in the section.
Disclaimer: While we have selected tutorials that closely align to our learning objectives, we did not produce these tutorials, nor were they specifically produced or tailored to accompany Openstax Precalculus. We are deeply grateful to James Sousa for compiling his incredibly robust and excellent library of video tutorials, which he has made available to the public under a CC-BY-SA license at http://mathispower4u.yolasite.com/. Most or all of the videos to which we link in our “Media” feature (plus many more) are found in the Algebra 2 and Trigonometry video libraries at the above site.
Each section of every chapter concludes with a well-rounded set of exercises that can be assigned as homework or used selectively for guided practice. With over 5900 exercises across the 12 chapters, instructors should have plenty to choose from1.
Section Exercises are organized by question type, and generally appear in the following order:
Chapter Review Features
Each chapter concludes with a review of the most important takeaways, as well as additional practice problems that students can use to prepare for exams.
OpenStax projects offer an array of ancillaries for students and instructors. Currently the following resources are available.
Please visit http://openstaxcollege.org to view an up-to-date list of the Learning Resources for this title and to find information on accessing these resources.
WebAssign is an independent online homework and assessment solution first launched at North Carolina State University in 1997. Today, WebAssign is an employee-owned benefit corporation and participates in the education of over a million students each year. WebAssign empowers faculty to deliver fully customizable assignments and high quality content to their students in an interactive online environment. WebAssign supports Precalculus with hundreds of problems covering every concept in the course, each containing algorithmically-generated values and links directly to the eBook providing a completely integrated online learning experience.
Learningpod is the best place to find high-quality practice and homework questions. Through our partnership with OpenStax College we offer easy-to-use assignment and reporting tools for professors and a beautiful practice experience for students. You can find questions directly from this textbook on Learningpod.com or through the OpenStax mobile app. Look for our links at the end of each chapter!
About Our Team
Lead Author, Senior Content Expert
Jay Abramson has been teaching Precalculus for 33 years, the last 14 at Arizona State University, where he is a principal lecturer in the School of Mathematics and Statistics. His accomplishments at ASU include co-developing the university’s first hybrid and online math courses as well as an extensive library of video lectures and tutorials. In addition, he has served as a contributing author for two of Pearson Education’s math programs, NovaNet Precalculus and Trigonometry. Prior to coming to ASU, Jay taught at Texas State Technical College and Amarillo College. He received Teacher of the Year awards at both institutions.
- Valeree Falduto, Palm Beach State College
- Rachael Gross, Towson University
- David Lippman, Pierce College
- Melonie Rasmussen, Pierce College
- Rick Norwood, East Tennessee State University
- Nicholas Belloit, Florida State College Jacksonville
- Jean-Marie Magnier, Springfield Technical Community College
- Harold Whipple
- Christina Fernandez
Faculty Reviewers and Consultants
- Nina Alketa, Cecil College
- Kiran Bhutani, Catholic University of America
- Brandie Biddy, Cecil College
- Lisa Blank, Lyme Central School
- Bryan Blount, Kentucky Wesleyan College
- Jessica Bolz, The Bryn Mawr School
- Sheri Boyd, Rollins College
- Sarah Brewer, Alabama School of Math and Science
- Charles Buckley, St. Gregory's University
- Michael Cohen, Hofstra University
- Kenneth Crane, Texarkana College
- Rachel Cywinski, Alamo Colleges
- Nathan Czuba
- Srabasti Dutta, Ashford University
- Kristy Erickson, Cecil College
- Nicole Fernandez, Georgetown University / Kent State University
- David French, Tidewater Community College
- Douglas Furman, SUNY Ulster
- Lance Hemlow, Raritan Valley Community College
- Erinn Izzo, Nicaragua Christian Academy
- John Jaffe
- Jerry Jared, Blue Ridge School
- Stan Kopec, Mount Wachusett Community College
- Kathy Kovacs
- Cynthia Landrigan, Erie Community College
- Sara Lenhart, Christopher Newport University
- Wendy Lightheart, Lane Community College
- Joanne Manville, Bunker Hill Community College
- Karla McCavit, Albion College
- Cynthia McGinnis, Northwest Florida State College
- Lana Neal, University of Texas at Austin
- Rhonda Porter, Albany State University
- Steven Purtee, Valencia College
- William Radulovich, Florida State College Jacksonville
- Alice Ramos, Bethel College
- Nick Reynolds, Montgomery Community College
- Amanda Ross, A. A. Ross Consulting and Research, LLC
- Erica Rutter, Arizona State University
- Sutandra Sarkar, Georgia State University
- Willy Schild, Wentworth Institute of Technology
- Todd Stephen, Cleveland State University
- Scott Sykes, University of West Georgia
- Linda Tansil, Southeast Missouri State University
- John Thomas, College of Lake County
- Diane Valade, Piedmont Virginia Community College
- Allen Wolmer, Atlanta Jewish Academy
- 1 5,924 total exercises. Includes Chapter Reviews and Practice Tests.