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OpenStudy (anonymous):
What are the vertex, focus, and directrix of the parabola with equation y=x^2-8x+18. I know that the vertex is (4,2) but I don't know about the other two.
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OpenStudy (anonymous):
OpenStudy (anonymous):
what?
OpenStudy (anonymous):
Convert to standard form, then your focus is (a + h, k)
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