Quadratic functions & equations: FAQ (article) | Khan Academy
https://www.khanacademy.org/math/algebra/x2f8bb11595b61c86:quadratic-functions-equations/x2f8bb11595b61c86:transform-quadratic-functions/a/quadratic-functions-equations-faq
WEBA quadratic is a type of function that can be written in the form f ( x) = a x 2 + b x + c , where a , b , and c are constants. What is a parabola? A parabola is the shape of the graph of a quadratic function. It looks like a symmetrical "U" shape, and can open either up or down depending on the function. Practice with our Parabolas intro exercise.
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