Mathematics
OpenStudy (superhelp101):

how do i find the vertex: (-8,5) Point: (2,1) i forgot :/

OpenStudy (jdoe0001):

find the? o_O

OpenStudy (superhelp101):

oh how do i find the directirx sorry

OpenStudy (jdoe0001):

hmmm what's the (2,1)? the focus point, or just a point in the parabola?

OpenStudy (superhelp101):

it is the focus point i believe

OpenStudy (jdoe0001):

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|

OpenStudy (superhelp101):

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

OpenStudy (superhelp101):

oh and i think i got this question could i ask you another one similar to this one?

OpenStudy (jdoe0001):

hmm something tells me that's not the focus point btw

OpenStudy (superhelp101):

the problem is vertex: ($(-2,8)$ Focus: $(-2, \frac{ 81 }{ 10})$

OpenStudy (superhelp101):

OpenStudy (superhelp101):

that is his work

OpenStudy (superhelp101):

i don't see how he got that for the directrix

OpenStudy (jdoe0001):

well... let's take a close look at the vertex and focus point|dw:1412809003817:dw|