Axis of Symmetry and Vertex

What is the green dashed line called?

• roots or x-intercepts
• parabola
• axis of symmetry
• line of dashes

A parabola has a vertex at (-3,2).
Where is the axis of symmetry?

• y = -2
• x = 3
• x = -3
• y = 2

What is the "formula" for finding the axis of symmetry? 

•  $y=ax^2+bx+c$  

•  $x=\frac{-b}{2a}$  

•  $y=mx+b$  

•  $x=\frac{-b\pm\sqrt{b^2-4ac}}{2a}$  

Find the axis of symmetry for  $y=x^2-8x+15$  

• x = -4

• x = 4

• y = 4

• y = -4

Find the vertex for  $y=x^2-8x+15$  

• (-4, 63)

• (-4, 31)

• (4, -1)

• (4, -31)

Find the axis of symmetry of
 $y=3x^2-6x+4$  

•  $x=1$ 

•  $x=-6$  

•  $x=2$ 

•  $x=-1$  

Find the vertex of  $y=3x^2-6x+4$   

•  $\left(1,\ 1\right)$  

•  $\left(1,\ 7\right)$  

•  $\left(2,\ 4\right)$  

•  $\left(-2,\ 28\right)$  

Find the axis of symmetry of  $y=-2x^2-16x+3$  

•  $x=4$  

•  $x=8$  

•  $x=-4$  

•  $x=-8$  

Find the vertex of   $y=-2x^2-16x+3$  

• (4, -93)

• (-4, 35)

• (-4,99)

• (8,3)

Using the Axis of Symmetry formula, find the coordinates of the vertex.
-x² + 4x - 6

• (2, -2)
• (-2, 2)
• (0, 2)
• (0, -2)