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Do Now 4/13/10 Take out homework from yesterday. Take out homework from yesterday. Text p. 632, #3-5, 12 – 32 multiples of 4, #40 Text p. 632, #3-5, 12.

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Presentation on theme: "Do Now 4/13/10 Take out homework from yesterday. Take out homework from yesterday. Text p. 632, #3-5, 12 – 32 multiples of 4, #40 Text p. 632, #3-5, 12."— Presentation transcript:

1 Do Now 4/13/10 Take out homework from yesterday. Take out homework from yesterday. Text p. 632, #3-5, 12 – 32 multiples of 4, #40 Text p. 632, #3-5, 12 – 32 multiples of 4, #40 Copy HW in your planner. Copy HW in your planner. Practice worksheet 10.2 evens Practice worksheet 10.2 evens

2 Homework Text p. 632, #3-5, 12 – 32 multiples of 4, #40 3) C 3) C 4) A 4) A 5) B 5) B 12 – 32) graphs 12 – 32) graphs 40) a) domain: -32 ≤ x ≤ 32 40) a) domain: -32 ≤ x ≤ 32 b) range: 0 ≤ y ≤ b) range: 0 ≤ y ≤

3 Objective SWBAT graph y = ax² + bx + c SWBAT graph y = ax² + bx + c

4 Section 10.2 “Graph y = ax² + bx + c” y = ax² + bx + c is a parabola that: -opens up if a > 0 -opens down if a < 0 -is narrower than y = x² if the |a| > 1 -is wider than y = x² if the |a| < 1 -has an axis of x = -(b/2a) -has a vertex with an x-coordinate of -(b/2a) -has a y-intercept of c. So the point (0,c) is on the parabola Properties of the Graph of a Quadratic Function

5 Finding the Axis of Symmetry and the Vertex of a Parabola Consider the graph y = -2x² + 12x – 7 (a) Find the axis of symmetry of the graph (b) Find the vertex of the graph Axis of symmetry: Substitute a = -2 a = -2 b = 12 b = 12 Substitute the x-value into the original equation and solve for y. The vertex of the parabola is the point (3,11)

6 Graph y = 3x² - 6x + 2 xy Step 1: Determine if parabola opens up or down Step 2: Find and draw the axis of symmetry Step 3: Find and plot the vertex Step 4: Plot two points. Choose two x-values less than the x- coordinate of the vertex. Then find the corresponding y-values. Step 5: Reflect the points plotted over the axis of symmetry. Step 6: Draw a parabola through the plotted points. UP Minimum Value

7 Graph y = -1/4x² - x + 1 xy Step 1: Determine if parabola opens up or down Step 2: Find and draw the axis of symmetry Step 3: Find and plot the vertex Step 4: Plot two points. Choose two x-values more than the x- coordinate of the vertex. Then find the corresponding y-values. Step 5: Reflect the points plotted over the axis of symmetry. Step 6: Draw a parabola through the plotted points. DOWN Maximum Value

8 Minimum and Maximum Values For y = ax² + bx + c, the y-coordinate of the vertex is the MINIMUM VALUE of the function if a > 0 or the MAXIMUM VALUE of the function if a 0 or the MAXIMUM VALUE of the function if a < 0. y = ax² + bx + c; a > 0 y = -ax² + bx + c; a < 0 minimum maximum

9 Homework Practice worksheet 10.2 form B evens Practice worksheet 10.2 form B evens


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