Araceae (not to be confused with Arecaceae) is a family of monocots in which the flowers are borne on a spadix, with female flowers at the bottom and male flowers at the top, enclosed in a spathe. It includes the calla[?] and the largest flower in the world, Amorphophallus titanum. The taro (Colocasia esculenta) is also in this family.
... 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 as ...