x^2+8y=0 find the vertex focus and directrix

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x^2+8y=0 find the vertex focus and directrix

Mathematics
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All of these are straight formula vertex (-b/2a, (4ac-b^2)/(4a)
u losing me
First you have to solve for y

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This is your go-by:\[y=ax ^{2}+bx=c\]That is how you determine what a and b is in above formula. The formula in the previous post represent (h,k) the vertex. Sorry for all the alphabet soup. Don't get lost, stay with me.
y didnt u use (x-h)^2=4p(y-k)
i know the answer to the problem i just dont understand how they got it
the answer is (0,0) focus is (0,-2) and the directrix is y=2 so how they get that
That is a valid method. If you don't understand that one. Try the one I posted above. It looks simpler to me.
how do i do the above one when i have no a and b
This is how you do it. I'll walk you through it. First solve for y. Put it in the form y=
i got -x^2/8=y
OK, from the formula, write your a, b, c
u lost me how do i do that to me they not relating im real smart but sometimes u gotta talk 2 me like im slow
I miswrote it the first time\[y=ax ^{2}+bx+c\]Your equation is\[y=(-1/8)x ^{2}+0x+0\]
ok so thats used 2 find what
First post message
ok so is b and c the vertex points
You choose your a, b, c. a=-1/8, b=0, c=0. Put it in the formula {(-0/2(-1), [4(-1)(0)-0^2]/[4(-1)]} which is (0,0). (h,k) is (0,0)
ok so the long w u find the vertex and u use the other one to help find wast goes in the 1st formula correct???
I'm sorry. I didn't get that.
the formula u wrote at the very 1st post is that the one i need to get the vertex but i formula to get the numbers that go in the first formula
dat made no sense lol
ok both formulas u gave me is that how i get the vertext??
The vertex is two numbers (0,0) So the formula represent the two numbers.
i dont understand how you did that 1 st formula its 2 much going on wit all th () and {} [] like no how r u doing dat the vertex is (0,0) now explain to me where in the formula i get dat from cuz trying to solve that formula looks impossible
That is from the first formula, the first message in the post, but if you look at it long enough, you would notice your b=0, c=0, so quickly everything else ends up 0.
i said dat like 7 post ago ur b and c is ur h and k which is he vertex right??
Well not exactly. It just so happened that the zeros dominated, you could very well have a=1, b=2, c=3. That doesn't mean h=2, k=3
uggggggggggggggghhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh ok how do u get the focus point
This might help http://www.youtube.com/watch?v=ZJf9shWlMz0
not helping
ok can u start fresh with me step by step??
I'm not up on all that. I just had that vertex info handy in a book I have around the house. Hang out at you Math lab at school.
not bout 2 happen ill just give up but thanks

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