y=3x^2 -4x -2...parabola
from quadratik equashun, y=(x-1.7207593)*(x+0.3874259)
so y=0 at x=-0.287 or x=+1.721...kerv go thru x-axis theer
tu get bottom av kerv, take derivativ...dy/dx=6x-4
this is 0 at x=-2/3...the slope=0 at x=-2/3
Thus, vertikal axis is vertikal line...x=-0.6666666...