1967 - Montreal, Canada - Expo '67, (Universal and International Exhibition of 1967) the most successful Fair ever, drawing more than 50 million visitors.
... of completing the square[?].
<math>ax^2+bx+c=0</math>
Dividing our quadratic equation by a, we have
<math>
x^2 + \left( \frac{b}{a} \right) x + ...