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Mathematics 17 Online
OpenStudy (anonymous):

What is the equation of the quadratic graph with a focus of (4, 0) and a directrix of y = -10? A. f(x)=-1/20(x-6)^2+5 B. f(x)=-1/20(x-6)^2-5 C. f(x)=1/20(x-6)^2+5 D. f(x)=1/20(x-6)^2-5

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