That's what my worksheet calls this.
Alright, so, I have a quadratic equation in standard form.
It's this:
Y = -X^2 + 16X - 18
So, X is equal to Negative B over 2A.
-16/2(-1) = -16/-2 = 8
I've figured out that, if I'm right, X is equal to 8.
Following that, I get this to find Y:
-1(8)^2 + 16(8) - 18 = 46
However, my graph (Cartesian plane, obviously) only goes to 10/-10. Did I do something wrong here? Or is it just a problem with the graph?

