Question 857318
You can graph it and get approximate values.
{{{-6x^2 + 9x + 5=0}}}
{{{graph(300,300,-3,3,-3,3,-6x^2 + 9x + 5)}}}
Looks like about {{{x=-1/2}}} and {{{x=2}}} would be approximate values.
For exact values you can complete the square or use the quadratic formula.