Question 859077
You could try completing the square and adjust the equation into standard form.

This would start as
{{{y=3(x^2+4x+8/3)}}}, and the term to add and subtract is 4.
{{{y=3(x^2+4x+4+8/3-4)}}}
{{{y=3((x-2)^2+8/3-12/3)}}}
{{{y=3((x-2)^2-4/3)}}}
{{{highlight(y=3(x-2)^2-4)}}}   ------ and read what you need directly from this.


Standard Form for Parabola, {{{y=a(x-h)^2+k}}}
Vertex (h,k)
Symmetry Axis, x=h