Functions (quadratic)

• 1

• 4

• -4

• -8

First step in graphing a Quadratic is identifying the vertex. What is the vertex?
 $f\left(x\right)\ =\ 100x^2$ 

•  $\left(100,\ 0\right)$ 

•  $\left(5,\ 0\right)$ 

•  $\left(10,\ 10\right)$ 

•  $\left(0,\ 0\right)$ 

the lowest point of the quadratic function

• Maximum

• Minimum

• Parabola

• Vertex

• none of these

What's the vertex of the following quadratic function?
-x² - 6x - 8

• (-3, 1)
• (3, -1)
• (-3, -1)
• (3, 1)

What is the axis of symmetry (or the x-value of the vertex) for the following equation?

y = 4x² - 8x + 9

• x = -8

• x = 1

• x = -1

• x = 2

Find the vertex for this equation.

 $y=-x^2+10x-26$  

•  $\left(5,\ -1\right)$  

•  $\left(-1,\ 5\right)$  

•  $\left(10,\ -26\right)$  

•  $\left(-26,\ 10\right)$  

• None of these

What can we find easily in vertex form? Choose all that apply.

• vertex

• y-intercept

• zeros

• axis of symmetry

• max or min value

• (-3, 5)

• (3, 5)

• (-3, -5)

• (3, -5)