For a masculine word, the article normally preceding is 'le' but if the word begins by a vowel, the 'e' of the article disappears like in this French sentence:
L'avion décolle.
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... zero and it is impossible to divide by it.)
The symbol
<math>\pm \sqrt {b^2-4ac}</math>
in the formula should be understood as "either of those element(s) ...