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Which equation matches this parabola?  (The directrix is line y = -2.)

 

 Feb 19, 2021
 #1
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It is a dome shaped parabola   so the  x^2   coefficient must be negative   so either   a or d

   at x = 0     a   will not work   but  d   does !      You got it correct !

 Feb 19, 2021

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