Question

find the x coordinate of the vertex of a parabola that passes through the given points
(0, -6) (-9-6)

Answer 1

is there anymore information with this problem? because there are infinitely many parabolas that can pass through these two points. each having a different vertex.

Answer 2

thats the only information given in the problem

Answer 3

do you know if these two points you've given are the endpoints of the latus rectum? before you laugh.... read this: http://www.wolframalpha.com/input/?i=latus+rectum

Answer 4

i have no idea

Answer 5

have you only been working with parabolas whose vertex lie on the x-axis and no where else?

Answer 6

yes

Answer 7

oh okay then.... had to do some detective work first huh? this should be easy..

Answer 8

since the two points given are on the same horizontal line then the x-coordinate of the vertex should be the midpoint of those two points...
do you know how to calculate the midpoint?