The standard equation $y^2 = 4ax$ (with $a > 0$) represents a parabola that opens:
Aupward
Bdownward
Cleftward
Drightward (toward positive x)
Answer & Solution
Correct answer: D. rightward (toward positive x)
$y^2 = 4ax$ with $a > 0$ opens **rightward**, vertex at origin, focus at $(a, 0)$.
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