Question 111223
Y=3X^2-X-1
{{{ graph( 300, 200, -6, 5, -10, 10, y = 3x^2 -x -1) }}} (graph 300x200 pixels, x from -6 to 5, y from -10 to 10, y = 3x^2 -x -1). 
x=-b/2a
x=-(-1/2*3)
x=-(-1/6)
x=1/6 answer for the x coordinate of the vertex.
y=3(1/6)^2-1/6-1
y=3(1/36)-1/6-1
y=3/36-1/6-1
y=1/12-1/6-1
y=(1-2-12)/12
y=-13/12 the y coordinate of the vertex.
vertex=(1/6,-13/12)