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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

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

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

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

I'm sorry. I didn't get that.

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 said dat like 7 post ago ur b and c is ur h and k which is he vertex right??

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??

not bout 2 happen ill just give up but thanks