# MATH 143 Pre-calculus Algebra and Analytic Geometry

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1 MATH 143 Pre-calculus Algebra and Analytic Geometry

2 Course Guide Self-paced study. Anytime. Anywhere! Math 143 Pre-calculus Algebra and Analytic Geometry University of Idaho 3 Semester-Hour Credits Prepared by: Theresa Allen, Ph.D. Lecturer University of Idaho RV: 5/06 2-Math 143 Copyright Independent Study in Idaho/Idaho State Board of Education

3 Table of Contents Welcome!... 1 Policies and Procedures... 1 Course Description... 1 Course Materials... 1 Course Delivery... 2 Course Introduction... 2 Lessons... 3 Exams... 3 Grading... 4 Contacting Your Instructor... 4 Disability Support Services... 4 Assignment Submission Log... 5 Lesson 1: Equations... 7 Lesson 2: Modeling with Equations: Inequalities Lesson 3: Coordinate Geometry: Lines Lesson 4: What is a Function? Graphs of Functions Exam 1 Information: Covers Lessons Lesson 5: Increasing and Decreasing Functions: Average Rate of Change: Transformations of Functions Lesson 6: Quadratic Functions: Maxima and Minima: Modeling with Functions Lesson 7: Combining Functions: One-to-One Functions and Their Inverses Lesson 8: Polynomial Functions and Their Graphs; Dividing Polynomials Exam 2 Information: Covers Lessons Lesson 9: Real Zeros of Polynomials Lesson 10: Complex Numbers: Complex Zeros and the Fundamental Theorem of Algebra Lesson 11: Exponential Functions: Logarithmic Functions Lesson 12: Laws of Logarithms: Exponential and Logarithmic Equations Exam 3 Information: Covers Lessons Lesson 13: Modeling with Exponential and Logarithmic Lesson 14: Systems of Linear Equations in Two Variables: Systems of Linear Equations in Several Variables Lesson 15: Parabolas: Ellipses Lesson 16: Hyperbolas: Shifted Conics Final Exam Information: Covers Lessons

4 Pre-calculus Algebra and Analytic Geometry 3 Semester-Hour Credits: U-Idaho Welcome! Whether you are a new or returning student, welcome to the Independent Study in Idaho (ISI) program. Below, you will find information pertinent to your course including the course description, course materials, course objectives, as well as information about lessons, exams, and grading. Policies and Procedures Refer to the ISI website at and select Students for the most current policies and procedures, including information on setting up accounts, student confidentiality, exams, proctors, transcripts, course exchanges, refunds, academic integrity, library resources, and disability support and other services. Course Description Algebraic, exponential, logarithmic functions; graphs of conics; zeros of polynomials; systems of equations, induction. Prerequisite: sufficient score on SAT, ACT, or math placement test; or Math 108 with grade of C or better. It is recommended that Math 143 be taken within two years of passing Math 108 or its equivalent. UI students: may be used as general education credit in J-3-c. Carries no credit after Math 160 or Math 170; carries 2 credits after Math 137 [Algebra with Applications]. 16 graded assignments, 4 proctored exams Be advised, exams for this course are sent one-at-a-time once appropriate lessons have been graded. Students may submit up to 2 assignments per week. Before taking exams, students MUST wait for grades and feedback on assignments, which may take up to three weeks after date of receipt by the instructor. ALL assignments and exams must be submitted to receive a final grade for the course. Course Materials Required Course Materials Stewart, James, Lothar Redlin, and Saleem Watson. Precalculus: Mathematics for Calculus. 5th ed. Belmont, CA: Thomson Brooks/Cole, ISBN-10: ISBN-13: Texas Instrument TI-30X IIS 2-Line Scientific Calculator ONLY. No other calculators allowed for test-taking (see image to right). Recommended Course Materials Stewart, James, Lothar Redlin, and Saleem Watson. Student Solutions Manual for Stewart/Redlin/Watson s Precalculus: Mathematics for Calculus. 5 th ed. Belmont, CA: Thomson Brooks/Cole, ISBN-10: ISBN-13: Independent Study in Idaho course materials are available for purchase at the VandalStore (University of Idaho bookstore). Your Registration Confirmation contains the VandalStore s contact information. 1

6 Lessons Each lesson includes the following components: Reading assignments Lesson objectives Practice problems Graded assignment Study Hints Keep a copy of every lesson submitted. Complete all assigned readings. Set a schedule allowing for completion of the course one month prior to your desired deadline. (An Assignment Submission Log is provided for this purpose.) Exams Submit all lessons preceding each exam prior to taking it. For each exam, your instructor strongly recommends that you wait until the lessons preceding the exam have been returned to you graded, with feedback, before taking the exam. For your instructor s exam guidelines, refer to the letters sent in your registration packet and the Exam Information sections in this study guide. The timing of the exams follows: Exam 1 (Sections ): follows Lesson 4. Exam 2 (Sections ): follows Lesson 8. Exam 3 (Sections ): follows Lesson 12. Final Exam (Sections ): follows Lesson 16. The first three exams will be 70 minutes long and will cover only the material studied since the previous exam. The exams will be made up of problems similar to the assigned problems (both practice problems and graded problems). The final exam will be similar to the first three exams except that it will be two hours long and will cover the entire course. That is, it will cover all assigned sections, from 1.5 through See Grading for specific information on exams, points, and percentages. Proctor Selection/Scheduling Exams All exams require a proctor. Refer to the ISI Policies and Procedures for guidelines on how to choose a proctor and schedule exams. Complete the Proctor Information Form and send it to the ISI office at least two weeks prior to scheduling your first exam. 3

7 Grading The course grade will be based upon the following considerations: The grading for this course will be based on 1,300 points, broken down as follows: Graded Assignments Exams Final Exam 300 points (20 points each, lowest assignment dropped) 600 points (200 points each) 400 points A letter grade is assigned only at the end of the course, as follows: A = D = B = F = C = The final course grade is issued after all lessons and exams have been graded. Acts of academic dishonesty, including cheating or plagiarism are considered a very serious transgression and may result in a grade of F for the course. Refer to the ISI Policies and Procedures for information about confidentiality of student grades, course completion, time considerations, and requesting a transcript. Contacting Your Instructor Instructor contact information is posted in the Course Rules document on your BbLearn site Disability Support Services Refer to the ISI Policies and Procedures for information on Disability Support Services (DSS). 4

8 Assignment Submission Log Lesson Section Graded Assignment Date Submitted exercises 4, 14, 44, 50, 70, 80, 82, 90, 96, exercises 20, 40, 60, 70 exercises 16, 38, 58, 68, 74, exercises 8, 44, 60, 88, 92 exercises 20, 28, 34, 46, 72 exercises 4, 16, 24, 36, 52 exercises 24, 34 (sketch by hand), 50, 60, 66 It is time to make arrangements with your proctor to take Exam exercises 2, 4, 16, 34 exercises 18, 32, 40, 64, 66, 68 exercises 10, 28, 36, 40, 64 exercises 2, 10, 20, 24, 26 exercises 4, 22, 26, 40, 46 exercises 8, 20, 28, 38, 54 exercises 2, 10, 16, 26, 30 exercises 22, 36, 50, 56, 62 It is time to make arrangements with your proctor to take Exam exercises 12, 36, 40, 44, 50, 56, 58, 60, 66, exercises 10, 34, 54, 58, 66 exercises 8, 20, 40, 52, 60 exercises 16, 30, 66, 78, 80 exercises 14, 32, 40, 54, 62 exercises 6, 28, 42, 56 exercises 10, 22, 32, 42, 50, 68 It is time to make arrangements with your proctor to take Exam 3. 5

9 exercises 2, 6, 8, 10, 12, 14, 18, 20, 22, exercises 10, 18, 22, 26, 46, 48, 52, 56 exercises 16, 18 exercises 12, 16, 32, 36, 40 exercises 14, 18, 24, 30, 38 exercises 8, 12, 20, 28, 38 exercises 2, 8, 14, 16, 20 It is time to make arrangements with your proctor to take the Final Exam. 6

10 Lesson 1 Equations Reading Assignments Section 1.5 Lesson Objectives Note: This is a good time to become familiar with the layout of the textbook. Each new section in the text has introductory material that the student should read very carefully. You will notice that the important words or topics will be in boldface. For example, on page 44 the words equivalent equations appear in bold type and are defined as two equations with exactly the same solution. You should be certain that you understand the meaning of all boldface words. The items found in the blue boxes are another important feature of this textbook. Concepts found in the blue boxes are very important and should be written down by the student. For example, on page 49 you will find one of the most important formulas in all mathematics, the Quadratic Formula. THE QUADRATIC FORMULA The roots of the quadratic equation ax 2 + bx + c = 0, where a 0, are 2 x = b ± b 4ac. 2a The examples are probably the most important aspect of each section. Each section contains several worked examples that are very similar to your homework problems. You should work through the examples very carefully and refer to them while doing your homework. Follow the directions in the lesson and then work odd-numbered practice problems related to the reading material. All odd-numbered problems have solutions in the back of the book. Objectives for Section 1.5 Know how to solve a linear equation ax + b = 0. Example: 5x 23 = 7x = 7x 5x 35 = 2x 35 = x 2 Know that to solve an equation you can do the following: 1. Add or subtract the same quantity from both sides. 2. Multiply or divide both sides by the same nonzero quantity. Note: The example 5x 23 = 7x + 12, given above, uses both 1 and Raise both sides of an equation to the same power. Examples are given on the next page. 7

11 Know the definition of the Quadratic Equation. ax 2 + bx + c = 0, where a, b, and c are real and a 0 Know the Zero-Product Property. Be able to factor a quadratic or trinomial expression or equation. (See Section 1.3, pages 27 31, for a review of factoring.) Examples: x 2 3x 28 = (x 7)(x + 4) 6x 2 + x 12 = (2x + 3)(3x 4) Be able to solve a simple quadratic equation by extracting square roots. Note: You should use this method when b = 0. Example: 2x 2 32 = 0 2x 2 = 32 x 2 = 16 x = ±4 Be able to solve a quadratic equation by completing the square. Example: x 2 + 6x 4 = 0 x 2 + 6x = 4 Add 4 to both sides. x 2 + 6x + 9 = 13 (x + 3) 2 = 13 Factor. Add ( 6 ) 2 = 9 to both sides. x + 3 = ± 13 Take square roots of both sides. x = 3± 13 Know the Quadratic Formula and how to use it. x = b ± b 2 4ac 2a 2 Subtract 3 from both sides. Be able to determine the types of solutions of a quadratic equation by checking the discriminant b 2 4ac. 1. If b 2 4ac > 0, then there are two distinct real solutions. Example: 16x 2 + 8x 3 = 0 8

12 x = 8 ± 8 2 4(16)( 3) 2(16) = 8 ± ± 16 = x = or x = x = 1 or 4 x = If b 2 4ac = 0, then there is exactly one real solution. Example: 4x 2 4x + 1 = 0 4 ± ( 4) 2 4(4)(1) x = 2(4) = 4 ± = 4 ± 0 8 x = 4 = If b 2 4ac < 0, then there are no real solutions. Example: 3x 2 + 6x + 5 = 0 x = 6 ± 62 4(3)(5) 2(3) = 6 ± 24 6 ± i = ± 2i 6 = 6 = 3 ± i 6 3 Here the solutions are complex numbers. Those will be covered in Lesson 10, Section 3.4. Be able to solve certain types of nonlinear or nonquadratic equations: Example: x 6 64 = 0 Let w = x 3 Try substitution. w 2 = (x 3 ) 2 = x 6 w 2 64 = 0 (w 8)(w + 8) = 0 Factor by difference of squares. (See Section 1.3.) w = 8 or w = 8 x 3 = 8 or x 3 = 8 Substitute back. 3 x 3 9

13 = 3 8 or 3 x 3 = 3 8 Take cube roots of both sides. x = 2 or x = 2 Example: 9x 2/3 + 24x 1/ = 0 9(x 1/3 ) (x 1/3 ) + 16 = 0 Let w = x 1/3. 9w w + 16 = 0 Substitute. (3w + 4)(3w + 4) = 0 Factor. 10

14 w = x 3 = 4 3 Substitute back. 3 (x 1 3 ) 3 = 4 Cube both sides x = 27 Example: x 3 + 2x 2 3x 6 = 0 (x 3 + 2x 2 ) + ( 3x 6) = 0 Group. x 2 (x + 2) 3(x + 2) = 0 (x 2 3)(x + 2) = 0 Factor by grouping. (x + 3 )(x 3 )(x + 2) = 0 Use the difference of squares with x 2 ( 3 ) 2. x = 3, x = 3, x = 2 For equations involving radicals or fractional powers, you may need to raise both sides to the same power. Always isolate the radical first. Example: 5 x 3 = 0 5 x = 3 Isolate the radical. ( 5 x ) 2 = 3 2 Square both sides. 5 x = 9 Solve for x. x = 4 Example: x x 5 = 1 x = x There are two radicals that must be isolated in steps. ( x ) 2 = ( x 5 + 1) 2 Square both sides. x = x x Isolate the final radical. 4 = 2 x = (2 x 5 ) 2 Square both sides. 16 = 4(x 5) Solve for x. 16 = 4x 20 11

15 36 = 4x x = 9 Note: See the third and fourth step above. ( x 5 + 1) 2 = ( x 5 + 1)( x 5 + 1). The FOIL process results in 2 x 5. 12

16 Know that a solution which does not satisfy the original equation is called an extraneous solution. (See Examples 11 and 13 on pages 53 54, and the following example.) Always check for extraneous solutions. Example: 3x(x 1) 1/2 + 2(x 1) 3/2 = 0 (x 1) 1/2 (3x + 2(x 1) = 0 Factor out (x 1) 1/2. (x 1) 1/2 (5x 2) = 0 Simplify. x = 1 or x = However, x = 5 leads to taking the square root of a negative number when you plug it back into the original equation. Therefore, the only solution is x = 1. Know how to solve absolute value equations. (See Example 14 on page 54.) Be sure to note that the absolute value equations you work with in this section will generally have two answers. a if a 0 Recall that a = a if a < 0 Practice Problems You will NOT turn these in. Section a. Read page 44 through Example 1 on page 45. b. Work page 55, exercises 1, 3, 9, 11, a. b. 3. a. b. 4. a. b. 5. a. b. 6. a. b. 7. a. b. Read from page 46, Quadratic Equations, through Example 6. Work page 55, exercises 25, 27, 37, 43, 45, 47, 49. Read from page 49, the box about the Quadratic Formula, through Example 8. Work page 55, exercises 59, 67, 69, 73. Read Example 9. Work page 56, exercise 101. Read from page 52, Other Equations, through the paragraph following Example 11. Work page 56, exercise 81. Read from page 53, the paragraph preceding Example 12, through Example 13. Work page 56, exercises 87, 89, 91. Read Example 14. Work page 56, exercises 95,

17 Now you are ready to complete and turn in the graded assignment. Graded Assignment Section 1.5, pages 55 56, exercises 4, 14, 44, 50, 70, 80, 82, 90, 96,

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