# Chapter 1 Notes: Quadratic Functions

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1 19 Chapter 1 Notes: Quadratic Functions (Textbook Lessons ) Graphing Quadratic Function A function defined by an equation of the form, The graph is a U-shape called a. Standard Form Vertex Form axis of symmetry: y-intercept: vertex is axis of symmetry is Intercept Form x-intercepts are axis of symmetry is between (p, 0) and (q, 0) Axis of Symmetry The axis of symmetry of a parabola is a that divides the parabola into The axis of symmetry always passes through of the parabola. The of the vertex is the of the axis of symmetry of the parabola. f(x)= x 2 How does a affect the graph of a quadratic function? Maximum or Minimum Value of a Quadratic Function The graph of where a 0, opens and has a minimum when a > 0. The graph opens and has a maximum when a < 0. The graph of f(x) = ax 2 f(x) = x 2. the graph of a > 1 a = 1 If a > 1, the graph of f(x) = x 2 is If 0 < a < 1, the graph of f(x) = x 2 is 0 < a < 1 0 x

2 20 Example 1: y = 1 2 x2 x 6 Form: a = b = c = Find Axis of Symmetry: Find the Vertex Maximum or Minimum value? y-intercept What is known from a? Example 2: y = (x + 5) Form: Vertex: Axis of Symmetry: What is known from a? Maximum or Minimum value? Change into Standard Form: Example 3: y = 2(x 3)(x + 1) Form: x-intercepts: Axis of Symmetry: Vertex: What is known from a? Maximum or Minimum value? Change into Standard Form: y-intercept?

3 *WORD PROBLEM Example 4: Suppose that a group of high school students conducted an experiment to determine the number of hours of study that leads to the highest score on a comprehensive year-end exam. The exam score y for each student who studied for x hours can be modeled by y = 0.853x x Which amount of studying produced the highest score on the exam? What is the highest score the model predicts? 21 Finding Maximums and Minimums in the Graphing Calculator. (p.10) (Textbook Lessons ) Solve Equations by Factoring: Factoring and the Zero Product Property can be used to solve many equations of the form x 2 + bx + c = 0. Intercept Form is Factored Form: solutions are The first step in Factoring is to factor out the GCF ( ) if the GCF is 1! Example 1) 16x 2 10x 3x 2 6x 4 2x Factoring a Trinomial of the Form x 2 + bx + c where a = 1 Example 2) x 2 7x x 2 8x 42

4 22 Factoring a Trinomial of the Form a x 2 + bx + c where a 1 Example 3) 3x 2 5x 2 Difference of Squares Example 4) x x 2 18 Perfect Square Trinomial Example 5) x x x 2 24 x + 18 Because of the Zero Product Property, the factors of a quadratic help us find the quadratic function. of a f(x) = x 2 + 2x 3

5 23 Using a Graphing Calculator to solve quadratic equations having approximate solutions. *Word Problem A painter is making a rectangular canvas for her next painting. She wants the length of the canvas to be 4 ft. more than twice the width of the canvas. The area of the canvas must be 30 ft 2. What should the dimensions of the canvas be? (Textbook Lessons 1.5) Solving Quadratic Equations by Finding Square Roots Example 1: Review: Simplifying Radicals Review: Rationalizing the Denominator

6 Example 2: Example 3: Solve: 3 5x 2 = 9 Solve: 3(x 2) 2 = 21 24

7 25 The height h (in feet) of an object t seconds after it is dropped can be modeled by the function h = 16t 2 + h 0 where h 0 is the object s initial height. *Word Problem Example 4: How long will it take an object dropped from a 550-foot tall tower to land on the roof of a 233-foot tall building? (Textbook Lessons 1.6) Complex Numbers The imaginary number : i 1 i 2 = i 3 = i 4 = What is i 22 =? What is i 31 =? What is i 1321 =? Simplify Example 1: Solve 2x = 4(x 3) 2 + 1

8 26 Complex Number: a bi, where b 0 Example 2: Plotting Complex Numbers in the Complex Plane Finding Absolute Values of Complex Numbers a is the real number part b is the imaginary number part (Find the DISTANCE from the Complex # to the origin) Plot 3 2i Plot 3 5i Find 2i Find 3 4i Find 1 5i Example 3: Adding and Subtracting Complex Numbers ( 7 + 5i) + (12 + 3i) (2 + 3i) + ( 8 6i) ( 7 + 5i) (12 + 3i) (4 + 10i) ( i) Example 4: Multiplying Complex Numbers i(3 + i) (2 3i)(6 2i) Conjugates (1 2i)(1 2i)

9 27 Example 5: Dividing Complex Numbers 2 3 5i 6 7i 3i 2 7i 1 i Example 6: Equate Complex Numbers Find the values of a and b that make the equation a (2b 6)i = 7 + 9i true. Conjugate Zeros Theorem tells us that if a + bi is a zero of f(x), then a zero. is also Find all zeros of f(x) = x Example: Write a standard form quadratic equation that has the solution 3 + i

10 28 ELECTRICITY The impedance in one part of a series circuit is 1 + 3j ohms and (Lessons the impedance 1.7) in Completing another part the of the Square circuit Creating is 7-5j ohms. Perfect Add Square these complex Trinomials to Solve Quadratic numbers to find the total impedance in the circuit. Equations ELECTRICITY Using the formula E = IZ, find the voltage E in a circuit when the current I is 3 - j amps and the impedance Z is 3 + 2j ohms. (Textbook Lessons 1.7) Completing the Square Creating Perfect Square Trinomials to Solve Quadratic Equations. Standard Form of a Perfect Square Trinomial: Factored Form of a Perfect Square Trinomial: Rewrite as: Examples: Solve 2x 2 36x x 2 10x

11 29 Find the value of c that makes each trinomial a perfect square. Then write the trinomial as a perfect square. x x + c x 2 5 x + c 3

12 30 Changing from Standard Form y = ax 2 + bx + c into Vertex Form by Completing the Square Example 1) Write:y = x 2 8x + 11 in vertex form. (Note: a 1) Example 2) Write:y = 5x 2 20x 24 in vertex form. (Note: a 1)

13 31 Word Problems STOPPING DISTANCE The formula d = 0. 05s s estimates the minimum stopping distance d in feet for a car traveling s miles per hour. If a car stops in 200 feet, what is the fastest it could have been traveling when the driver applied the brakes? (Textbook Lessons 1.8) The Quadratic Formula and the Discriminant Let s take the standard form for a quadratic equation and solve for x (by completing the square): y = ax 2 + bx + c

14 32 Quadratic Formula Solve: x 2 + 2x = 3 4x 2 + 8x + 7 = 4 6x 2-12x + 1 = 0 Discriminant the. b 2 4ac 0 b 2 4ac 0 b 2 4ac 0

15 33 Describe the nature of the solutions of each quadratic before you solve by calculating the discriminant! 2x 2 6x 7 x 2 6x 9 0 Note: Often with respect to polynomial functions, zeros are also called roots! Solutions/Zeros/Roots of a polynomial may be real or unreal numbers. However, x-intercepts are just real numbers (where the polynomial crosses the x-axis on the Cartesian plane: a plane consisting of only real ordered pairs!) A man tosses a penny up into the air above a 100-feet deep well with a velocity of 5 ft/sec. The penny leaves the man s hand at a height of 4 ft. How long will it take the penny to reach the bottom of the well?

16 34 Ex. 2 A ball is hit straight up from a height of 4 ft. with an initial velocity of 60 ft/sec. a. Write an algebraic representation b. Find the number of seconds to reach the maximum height? c. What is the maximum height of the ball? d. How long does it take for the ball to hit the ground? e. When will the height reach 40 feet?

17 35 (Textbook Lessons 1.9) Graph Quadratic Inequalities To graph a quadratic inequality in two variables, use the following steps: 1. Graph the related quadratic equation y = ax 2 + bx + c. Use a line for < or >; use a line for or. 2. Test a inside the parabola. If it satisfies the inequality, shade the region otherwise, shade the region the parabola. the parabola; y > x 2-8x + 17 y y x 2 4 y < x 2 y O x O x

18 36 Solve Quadratic Inequalities Quadratic inequalities in one variable can be solved graphically or algebraically. Graphical Method To solve ax 2 + bx + c < 0: First graph y = ax 2 + bx + c. The solution consists of the x-values for which the graph is below the x-axis. To solve ax 2 + bx + c > 0: First graph y = ax 2 + bx + c. The solution consists the x-values for which the graph is above the x-axis. 0 2x 2 + 4x y O x Algebraic Method Find the roots of the related quadratic equation by factoring, completing the square; or using the Quadratic Formula. 2 roots divide the number line into 3 intervals. Test a value in each interval to see which intervals are solutions. Use a Sign Chart (Sign Analysis) to Solve. Express solution in Interval Notation. x 2 + 2x < 0 2x 2 + 5x 12 (x 4) 2 (> 0 x 2 4x + 7 0

19 37 Extension: Revisit Modeling with Quadratic Functions Example 1: Writing Quadratic Function in Vertex Form O Example 2: Writing a Quadratic Function in Intercept form Example 3: Writing a Quadratic Function in Standard Form This parabola passes through ( 4,1), (0,9), and (1,16). This parabola passes through (3, 3), (6,12), and (9,27)

20 38 Example 4: Using Quadratic Regression to Find a Model A study compared the speed x (in miles per hour) and the average fuel efficiency y (in miles per gallon) for cars. The results are shown in the table. Use your graphing calculator to find a quadratic model in standard form for the data. Speed, x Fuel Efficiency, y Best-Fitting Quadratic Model is: Predict Fuel Efficiency for a speed of 75 mph. Find the speed that maximizes a car s fuel efficiency. Revisit Piecewise Functions Graph x f( x) 2 3, x0 2, 0 2 x x Graph f x x x x 5, x 4 2 ( x 4) 1, 6 x 3 2 ( ) 2, 3 4

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