Question 873756
Getting it into the format
y = ax^2 + bx + c = 0
Quadratic formula ALWAYS works
{{{x = (-b +- sqrt( b^2-4*a*c ))/(2*a) }}} 
Other ways
1) Factoring, if You can, to determine solution  ***most popular
2) Using Matrices
3) Completing the Square and setting y to 0.