http://demonstrations.wolfram.com/QuadraticInVertexFormOrTurningPointForm
The Wolfram Demonstrations Project contains thousands of free interactive visualizations, with new entries added daily.
Expressing a quadratic in vertex form (or turning point form) lets you see it as a dilation and/or translation of y=x^2. A quadratic in standard form can be expressed in vertex form by completing the square.
Contributed by: Rod Bate Based on a program by: Stephen Wolfram
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