Has been portayed in a number of songs including "Mr Sandman" by The Chordettes[?], and (in a slightly different form) "Enter Sandman" by Metallica.
... <math>ax^2+bx+c=0</math> Dividing our quadratic equation by a, we have <math> x^2 + \left( \frac{b}{a} \right) x + ...