Graphing quadratics: standard form

Sal Khan

https://www.khanacademy.org/math/algebra/quadratics/graphing-quadratic-functions/v/graphing-a-parabola-using-roots-and-vertex

Sketching the graph of the quadratic in standard form by calculating the roots or x-intercepts and then finding the turning point or vertex. y=5x^2-20x+15

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