1967 - Montreal, Canada - Expo '67, (Universal and International Exhibition of 1967) the most successful Fair ever, drawing more than 50 million visitors.
... roots of the equation. The formula reads
<math>
x=\frac{-b \pm \sqrt {b^2-4ac}}{2a}
</math>
The term b2 – 4ac is called the discriminant of the ...