I can't find the vertex nor the "widest equation" and it's driving me mad. I'm POSITIVE the widest equation is the one with the 1/5 coefficient.

Question

anonymous · Answer

attachment

anonymous · Answer

And i've graphed them all a hundred times, and can't for the life of me find a vertex of 2, -1 anywhere. Either that or I'm incredibly stupid.

anonymous · Answer

(my apologies, I'm looking for vertex (2,-1)

ddcamp · Answer

If you have the equation
$$y = ax^2+bx+c$$
The x coordinate of the vertex is at:
$$x = \frac{-b}{2a}$$

Try plugging the a and b values of the equations to see which one(s) have the vertex at x=2.