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OpenStudy (anonymous):
I need help finding the focus to this parabola please. My center is at origin, I have a vertices of (5,4) and I got 4=a(5-0)^2+0 as my first equation. I found a=4/25. So then to find the focus I use a=1/4c that's where i need help. My answers are confusing and I think I'm doing this wrong.
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