Question 981430
Put into standard form and then try to graph.


{{{y=3(x^2-4x-1)}}}
Study the lesson on Completing The Square.
{{{y=3(x^2-4x+4-4-1)}}}
{{{y=3((x-2)^2-5)}}}
{{{highlight(y=3(x-2)^2-15)}}}


Now you know the vertex, how the parabola is oriented, and can find the zeros.


{{{graph(300,300,-11,11,-16,6,3x^2-12x-3)}}}