**Title:** Interactive Graph of a Parabola (Standard Form of a Quadratic Equation)

**Description:**
This is an interactive graph of a quadratic equation(parabola) in standard form: y=ax^2+bx+c. Moveable sliders for the value of "a", "b", and "c" allow those values to be changed to explore the vertex, axis of symmetry, and direction of opening.

**Standard(s): **

[MA2015] ALT (9-12) 25: Recognize when the quadratic formula gives complex solutions, and write them as *a* ± *bi* for real numbers *a* and *b*. [A-REI4b] (Alabama)