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 Quadratic Function has the form y=ax 2 +bx+c where a cannot be 0 and the graph is a “U-shaped” called a parabola.  --ax 2 : quadratic term  --bx:

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Presentation on theme: " Quadratic Function has the form y=ax 2 +bx+c where a cannot be 0 and the graph is a “U-shaped” called a parabola.  --ax 2 : quadratic term  --bx:"— Presentation transcript:

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2  Quadratic Function has the form y=ax 2 +bx+c where a cannot be 0 and the graph is a “U-shaped” called a parabola.  --ax 2 : quadratic term  --bx: linear term  --c: constant term  --Vertex: the lowest or highest point of a parabola.  --Axis of symmetry: the vertical line through the vertex of parabola.  --if a is positive, parabola opens up  --If a is negative, parabola opens down  --if a > 1, the graph is narrower than the graph of y =x squared --if a <1, the graph is wider than the graph of y =x squared  --maximum value: the y-value of its vertex (if the parabola opens down)  --minimum value: The y-value of its vertex (if the parabola opens up)

3  Forms for Quadratic Function: I. Standard Form Equation: y=ax 2 + bx + c A. If a is positive, parabola opens up B. If a is negative, parabola opens down C. The x-coordinate of the vertex is at D. To find the y-coordinate of the vertex, plug the x- coordinate into the given eqn. E. The axis of symmetry is the vertical line x= F. Choose 2 x-values on either side of the vertex x- coordinate. Use the equation to find the corresponding y-values. G. Graph and label the 5 points and axis of symmetry on a coordinate plane. Connect the points with a smooth curve

4 II. Vertex Form Equation: y=a(x-h) 2 +k A. If a is positive, parabola opens up B. If a is negative, parabola opens down. C. The vertex is the point (h,k). D. The axis of symmetry is the vertical line x=h. E. Don’t forget about 2 points on either side of the vertex!

5 III. Intercept Form Equation: y=a(x-p)(x-q) A. The x-intercepts are the points (p,0) and (q,0). B. The axis of symmetry is the vertical line x= C. The x-coordinate of the vertex is D. To find the y-coordinate of the vertex, plug the x- coord. into the equation and solve for y. E. If a is positive, parabola opens up If a is negative, parabola opens down. OR—You could just FOIL it, and graph the same way you did the standard equation.

6 IV. Graph: Examples: (notice as you graph which axis the parabola reflects over) A. y=2x 2 -8x+6

7  Graph  A.  B.  C.  D.  E.

8 How is graphing an inequality different than graphing an equation. Your line maybe solid or dotted. You have to shade the correct region.

9 V. Graph the following inequalities. y>x 2 + 3x -4 y< (x -5)(x+2)

10 V. Write the equation of the parabola with the given info. A. Vertex (2, 3) AND (0,1) B. Vertex (1,3) and (-2, -15)

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