SOLUTION: whats the equation of a parabola with a vertex at (-3, 7) and a directrix x = -8?

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Question 1088091: whats the equation of a parabola with a vertex at (-3, 7) and a directrix x = -8?
Answer by josgarithmetic(39618) About Me  (Show Source):
You can put this solution on YOUR website!
4%2A5%28x%2B3%29=%28y-7%29%5E2
highlight%2820%28x%2B3%29=%28y-7%29%5E2%29

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parabola with a vertex at (-3, 7) and a directrix x = -8
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Distance from (-3,7) to (-8,y) is 5 units; same distance as vertex from focus. Horizontal symmetry axis, parabola opening to the right.