(b)complete the table to show where the function is positive (above the x axis) or negative (below the x axis) for each interval.
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1 Lesson 3.4 Graph and Equation of Polynomial Functions Part A: Graph of a Polynomial Function the x intercepts of the graph the zeros of the function the roots of the equation Multiplicity (of a zero) A factor that is repeated. (also called the "order" of a zero) Example 1 Consider the graph of the function a) The x intercepts divides the x axis into three intervals. sign diagram (b)complete the table to show where the function is positive (above the x axis) or negative (below the x axis) for each interval. set notation interval notation positive negative (c) What effect does a single root have on the graph? (d) What effect does a double root have on the graph? 1
2 Example 2 Consider the graph of the function Zeros/Multiplicity Positive Interval: Negative Interval: Example 3 Consider the function Zeros/Multiplicity: Positive Interval: Negative Interval: 2
3 Think About Note: a zero of odd multiplicity, the sign of the function a zero of even multiplicity, the sign of the function 3
4 Your Turn 1 (a) For the following graphs, determine the zero(s) and state the multiplicity. (b) State the intervals where the function is positive and the intervals where it is negative (i) zeros: positive interval: negative interval: (ii) zeros: positive interval: negative interval: 4
5 (iii) zeros: positive interval: negative interval: (iv) zeros: positive interval: negative interval: Textbook Questions: pg. 148 # 4abc 5
6 Sketch the Graphs of Polynomial Functions using intercepts and multiplicity of zeros Example 4 Sketch the graph of each function. Label all intercepts. 6
7 Example 5 Sketch the graph of each function. Label all intercepts. 7
8 Your Turn 2 Sketch the graph of each function. Label all intercepts. 8
9 Your Turn 3 Draw the graph of a polynomial with the following characteristics: x intercepts: ( 1,0) and (3,0) sign of the leading coefficient: positive polynomial degree: 4 relative maximum at (1,8) Textbook Questions: pg #1ab, 2ac, 7cd, 8cd, 9ef 9
10 Part B: Equation of a Polynomial Given its Graph Reminder: Identify the following characteristics: factors x intercepts multiplicity of zeros sign and value of the leading coefficient y intercept Example 6 Determine the equation of the polynomial function that corresponds to the graph: 10
11 Your Turn 4 Determine the equation of the polynomial function that corresponds to the graph: Example 7 Determine the equation for each polynomial function: (a) a cubic function with zeros 2 (multiplicity 2) and 4 and has a y intercept
12 (b) a quintic function with zeros 1 (multiplicity 3) and 4 (multiplicity 2) and has a constant term of 6. (c) a quartic function with a negative leading coefficient, zeros 3 (multiplicity 2) and 3 (multiplicity 2) and has a y intercept of 5. Textbook Questions: pg.149 #10abcd, pg.150 #14abc 12
13 Part C: Solve Problems by Modeling a Situation with a Polynomial Function Create an equation Factor Solve Review: Using Quadratic Functions Example 8 One leg of a right triangle exceeds the other leg by four inches. The hypotenuse is 20 inches. Find the length of the shorter leg of the right triangle. 13
14 Example 9 Three consecutive odd integers have a product of 315. What are the integers? 14
15 Example 10 The length, width and height of a rectangular box are cm, cm, and cm respectively. Determine the dimensions of the box if the volume is 132 cm 2 Is it necessary to place restrictions on the independent variable? 15
16 Example 11 An open topped box with a volume of 72 in 3 is made from a square piece of cardboard by cutting equal squares from each corner and folding up the sides. If the original dimension of the cardboard is 10 in., find the side length that is cut from each corner. 16
17 Example 12 The actual and projected number, C (in millions), of computers sold for the region between 2010 and 2020 can be modelled by where represents During which year are 8.51 million computers projected to be sold? Textbook Questions pg #12, 13,
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48 5.1, 5.2, 5.3 Properites of Exponents last revised 6/7/2014 Properites of Exponents 1. x a x b = x a+b *Simplify each of the following: a. x 4 x 8 = b. x 5 x 7 x = 2. xa xb = xa b c. 5 6 5 11 = d. x14
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I, 0 SUMMATIVE ASSESSMENT I, 0 0 MATHEMATICS / MATHEMATICS MATHEMATICS CLASS CLASS - IX - IX IX / Class IX MA-0 90 Time allowed : hours Maximum Marks : 90 (i) (ii) 8 6 0 0 (iii) 8 (iv) (v) General Instructions: