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Graphing Quadratics 					                Graphing y = ax2 + bx + c
Review ,[object Object],y=ax2+ bx + c Where a is the number next to the x2,              b is the number next to the x, and               c is the constant term
Graphing Quadratics	 Graphs of quadratics must include: The vertex The x-intercepts The y-intercept y- intercept x - intercepts Vertex
Graphing Quadratics Ex) y = 3x2 +6x – 24 To graph this quadratic we need to find all of the key elements. First let’s start by finding the vertex! To find the x-coordinate of the vertex we will use the formula x =  Plugging in for a and b, we see that         x = -6 = -6  =  -1              3•2    6
Graphing Quadratics Ex) y = 3x2 +6x – 24 Now we will plug in the x-coordinate we found into the equation to find the y-coordinate. Y = 3•(-1)2 + 6•(-1) – 24y = 3•(1) + 6•(-1) – 24y = 3 – 6 – 24 y = -27 So the vertex is at the point (-1, -27)
Graphing Quadratics Ex) y = 3x2 +6x – 24 Now we need to find the x-intercepts. To find the x-intercepts you can use one of two ways. The first way is to use the quadratic formula.  Or we can use the factoring method. In this case, the factoring method is much easier.
Graphing Quadratics Ex) y = 3x2 +6x – 24 To factor this equation we see that there is a 3 common to all three terms. So we will first factor that out to the fronty = 3(x2 +2x – 8) Now we need factors of -8 that will add to 2.    y = 3(x + 4)(x – 2)  Now set each parenthesis to 0 and solve for x.           x + 4 = 0 and x – 2 = 0        x = -4      and   x = 2
Graphing Quadratics	 Ex) y = 3x2 +6x – 24 Finally we need to find the y-intercept. Plug in 0 for x and then solve.       y = 3x2 +6x – 24y = 3(0)2+6(0) – 24 y = 0 + 0 – 24    y = -24 Now that we have all of the pieces we can put them on the graph.
Graphing Quadratics	 Information: y = 3x2 +6x – 24 Vertex (-1, -27) x-intercepts x = 4, & x = -2 y-intercept  y = -24 Graph

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Graphing Quadratic Equations

  • 1. Graphing Quadratics Graphing y = ax2 + bx + c
  • 2.
  • 3. Graphing Quadratics Graphs of quadratics must include: The vertex The x-intercepts The y-intercept y- intercept x - intercepts Vertex
  • 4. Graphing Quadratics Ex) y = 3x2 +6x – 24 To graph this quadratic we need to find all of the key elements. First let’s start by finding the vertex! To find the x-coordinate of the vertex we will use the formula x = Plugging in for a and b, we see that x = -6 = -6 = -1 3•2 6
  • 5. Graphing Quadratics Ex) y = 3x2 +6x – 24 Now we will plug in the x-coordinate we found into the equation to find the y-coordinate. Y = 3•(-1)2 + 6•(-1) – 24y = 3•(1) + 6•(-1) – 24y = 3 – 6 – 24 y = -27 So the vertex is at the point (-1, -27)
  • 6. Graphing Quadratics Ex) y = 3x2 +6x – 24 Now we need to find the x-intercepts. To find the x-intercepts you can use one of two ways. The first way is to use the quadratic formula. Or we can use the factoring method. In this case, the factoring method is much easier.
  • 7. Graphing Quadratics Ex) y = 3x2 +6x – 24 To factor this equation we see that there is a 3 common to all three terms. So we will first factor that out to the fronty = 3(x2 +2x – 8) Now we need factors of -8 that will add to 2. y = 3(x + 4)(x – 2) Now set each parenthesis to 0 and solve for x. x + 4 = 0 and x – 2 = 0 x = -4 and x = 2
  • 8. Graphing Quadratics Ex) y = 3x2 +6x – 24 Finally we need to find the y-intercept. Plug in 0 for x and then solve. y = 3x2 +6x – 24y = 3(0)2+6(0) – 24 y = 0 + 0 – 24 y = -24 Now that we have all of the pieces we can put them on the graph.
  • 9. Graphing Quadratics Information: y = 3x2 +6x – 24 Vertex (-1, -27) x-intercepts x = 4, & x = -2 y-intercept y = -24 Graph