Australia:
Belgium:
Canada:
Czech Republic:
Finland:
France:
Germany:
Hong Kong:
Japan:
Netherlands:
New Zealand:
Portugal:
Puerto Rico:
Sweden:
Switzerland:
United Kingdom:
United States:
... we have <math> x^2 + \left( \frac{b}{a} \right) x + \frac{c}{a}=0 </math> which is equivalen ...