Section 8.1, 3, 4-Quadratics and Parabolas
Parabola worksheet-identify vertex and whether opening up or down and find x-intercepts.
For a video explanation, see
https://www.khanacademy.org/math/algebra/quadratics/solving_graphing_quadratics/v/quadratic-functions-3
They don't explain finding the vertex in quite the same way we have done it in class.
I believe the following video finds the vertex the way we have done it in class.
https://www.khanacademy.org/math/algebra/quadratics/solving_graphing_quadratics/v/finding-the-vertex-of-a-parabola-example