how do i find the vertex: (-8,5) Point: (2,1) i forgot :/
find the? o_O
oh how do i find the directirx sorry
hmmm what's the (2,1)? the focus point, or just a point in the parabola?
it is the focus point i believe
well.. draw both, the vertex and given focus point notice the distance between both the directrix is EXACTLY the same distance from the vertex just in the opposite direction|dw:1412808264398:dw|
oh yeah! i got that but their is a mathematical way to solve this and i can show you what my math teacher did. I am confused with some of his work
oh and i think i got this question could i ask you another one similar to this one?
hmm something tells me that's not the focus point btw
the problem is vertex: (\[(-2,8)\] Focus: \[(-2, \frac{ 81 }{ 10})\]
that is his work
i don't see how he got that for the directrix
well... let's take a close look at the vertex and focus point|dw:1412809003817:dw|
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