I count 14 words (11 in the title, 1 in the body + 2 times "figure"), not 2. And 14 more if you count the authors names and affiliation as words.
(x = (-b±sqrt(b^2-4 a c))/(2 a))
And I guess one way to think about it is that terms in an expression can be viewed as letters, so the expression then becomes a word.