The Council on Foreign Relations is "dedicated to increasing America’s understanding of the world and contributing ideas to U.S. foreign policy. The Council accomplishes this mainly by promoting constructive debates and discussions, clarifying world issues, and publishing Foreign Affairs[?]."
... 2, the element 2a is zero and it is impossible to divide by it.)
The symbol
<math>\pm \sqrt {b^2-4ac}</math>
in the formula should be understood ...