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Regan is trying to find the equation of a quadratic that has a focus of (−2, 5) and a directrix of y = 13. Describe to Regan your preferred method for deriving the equation. Make sure you use Regan's situation as a model to help her understand.

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can you guys help me plz

y = -1/16(x - (-2))^2 +9.

I dont understand

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