Question 1931
I am going to show you step by step:
y=-3x^2+2x+7
{{{x=(3+-sqrt(93))/(-6)}}}     After you do all the substitutions.
{{{x=(3+-183/19))/(-6)}}}      Since this technology doesn't let me do the work 
                               without showing ERROR. I am going to show you
                               the answers.
x= -40/19 (-2 2/19), 21/19 (1 2/19)