Question

...I officially hate functions...the vertex of the function's graph is given. find c.
y=c-x^2-2x (-1,3)

Answer 1

You know that the point (-1,3) is a solution of the function. Plug in -1, and see what value of c will work to make it equal to 3.

Answer 2

do you really have nothing better to do?

Answer 3

im gonna be honest, i really dont LOL

Answer 4

well then i feel sorry for you

Answer 5

Ignoring that, does what I suggested make any sense?
We know that WHEN x is -1, y = 3. So we plug in -1 and set equal to 3, like this
c-(-1)^2-2(-1) = 3

Answer 6

ya it makes sense...i'm just working through my options at this point...

Answer 7

Haha okay, well, once you've done that, the rest is just simple algebra.

Answer 8

yes it is:) i believe my final answer is c=2....thanks once again lol :)

Answer 9

c-(-1)^2-2(-1) = 3
c-1-(-2) = 3
c-1+2 = 3
c+1 = 3
c = 2
Very good =)