Lesson 3: Exploring Quadratic Relations Graphs Unit 5 Quadratic Relations
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1 (A) Lesson Context BIG PICTURE of this UNIT: CONTEXT of this LESSON: How do we analyze and then work with a data set that shows both increase and decrease What is a parabola and what key features do they have that makes them useful in modeling applications How do I use graphs, data tables and algebra to analyze quadratic equations? Where we ve been Where we are Where we are heading In Lesson 1, you looked for number patterns & graphed in data from a variety of activities & in Lesson 2, you determined regression equations of quadratic data sets What are the special features of the graphs of quadratic relations How can I use graphs of quadratic relations to make predictions from quadratic data sets & quadratic models and quadratic equations (B) Lesson Objectives: a. Generate graphs of quadratic relations on the TI-84 from given equations b. Introduce special features of these graphs called parabolas c. Use the graphing calculator to analyse the parabolas and determine these special features d. Use the special features of the parabolas to answer contextual questions in quadratic modelling questions (C) KEY REVIEW POINTS Main Point to Lesson 1 The KEY POINT to Lesson 1 was (D) KEY REVIEW POINTS The TWO Main Points to Lesson 2 The FIRST KEY POINT to Lesson 2 was The SECOND KEY POINT to Lesson 2 was
2 (E) Special Features of Parabolas Define/describe/explain the following and label them on the diagram i) Direction of opening Define/describe/explain the following and label them on the diagram i) Direction of opening ii) Vertex/optimum point/max or Min point ii) Vertex/optimum point/max or Min point iii) Optimal value/max or min value iii) Optimal value/max or min value iv) Zeroes/x-intercepts iv) Zeroes/x-intercepts v) Y-intercept v) Y-intercept vi) Axis of Symmetry vi) Axis of Symmetry
3 (F) Special Features of Parabolas From A GRAPH From the graph of the quadratic relation below, complete the From the graph of the quadratic relation below, complete the (g) Determine the value of y when x = 3 (g) Determine the value of y when x = 2 (h) Determine the value of x when y = -21 (h) Determine the value of x when y = 6 EQUATION is y = (x + 4)(x 8) EQUATION is y = -0.5x 2 + 5x + 12
4 (G) Special Features of Parabolas From an EQUATION & the TI-84 From the equation y = 2x 2 12x 32, complete the From the equation y = -0.25(x 5) 2 + 4, complete the (g) Determine the value of y when x = 1 (g) Determine the value of y when x = -8 (h) Determine the value of x when y = (h) Determine the value of x when y = -12 (i) Show a sketch with the key features labeled (i) Show a sketch with the key features labeled.
5 (H) Special Features of Parabolas From an EQUATION & the TI-84 From the equation y = -2(x + 4)(x 7), complete the From the equation y = 3x x 5, complete the (g) Determine the value of y when x = 5.5 (g) Determine the value of y when x = -8 (h) Determine the value of x when y = 30 (h) Determine the value of x when y = -12
6 (I) Modelling with Quadratic Relations Ex 1 Examine the graph of the quadratic relation below: (i) What are the co-ordinates of the vertex? (ii) What is the optimal value? (iii) What is the equation of the axis of symmetry? (iv) What are the zeroes of the relation? (v) What would be the sign of the second differences? (vi) CHALLENGE: Determine the equation of this parabola. b) Ex 2 Two parabolas each have zeroes of 1 and 11. One has a maximum value of 12, the other has a minimal value of -6. Sketch the 2 parabolas on the same axes. c) CONNECTION TO ALGREBRA A relation is defined by the equation A(L) = 24L L 2. For this relation: i) Write the equation in factored form by removing the GCF. ii) Determine the zeros. iii) State the equation of the axis of symmetry. iv) Graph it on the GDC and determine the optimal value. v) Sketch the parabola, labeling the key features
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