18x2+9x-14=0.
Using the quadratic formula we get:
x=(-9±√(81-(4×18×(-14))))/36,
x=(-9±√(81+(4×18×14)))/36,
x=(-9±√(81+1008))/36,
x=(-9±√1089)/36=(-9±33)/36=24/36=2/3 or -42/36=-7/6.
Or we could simply factorise the original equation: (3x-2)(6x+7).
You can see how the discriminant becomes 1089.