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13 April, 18:44

A parabola has a vertex at (-1, 0) and opens down. What is the equation of the parabola?

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  1. 13 April, 20:30
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    The vertex form: y = a (x - h) ² + k

    (h; k) the coordinates of vertex

    (-1; 0) ⇒ h = - 1 and k = 0

    therefore y = a (x + 1) ²

    A parabola opens down, therefore a < 0.

    Answer: y = a (x + 1) ² where a < 0.
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