When \(a \ne 0\), there are two solutions to \(ax^2 + bx + c = 0\) and they are $$x = {-b \pm \sqrt{b^2-4ac} \over 2a}.$$ AsciiMath is an easy-to-write markup language for mathematics: `sum_(i=1)^n i^3=((n(n+1))/2)^2`