​Quadratics

1. Direction of Opening

     - A parabola can open up (smile) or down (frown). 

 

2. Vertex

     - The maximum or minimum point on the graph. It is the point         where the graph changes direction. 

     - Labelling: (x,y)

 

3. Optimal Value

     - The highest or lowest point also known as the y-value of the         vertex.  

     - Labelling: y=#

 

4. Axis of Symmetry

     - Divides the parabola in half. It is along the y-axis but is                known as the x-value of the vertex. 

     - Labelling: x=#

 

5. Y-intercept

     - Where the parabola crosses the y-axis. 

     - Labelling: (0,#)

 

6. X-intercepts/Zeroes/Roots

    - Where the parabola crosses the x-axis. Can be one or two             points depending on where the parabola is on the graph. 

    - Labelling: (#,0) OR (#,0) and (#,0)