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This parabola opens downward. It rises from negative infinity, peaks within a few units of the origin,

then heads back down to negative infinity.

The following numbers are all rounded. Nothing comes out even.

-- The maximum value of 'y' is 4.571429, at [ x = -0.2857 ].

-- The parabola crosses the x-axis at [ x = -1.0938 ] and [ x = 0.5224 ].

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