what is the vertex of y=-x+8x+14
I assume this is.....
y= -x^2+8x+14
The x coordinate of the vertex is given by -b/2a = -8/2(-1) = 4
And the y coordinate is given by
y = -(4)^2 + 8(4) + 14 = -16 + 32 + 14 = 30
So the vertex is (4, 30)