In Roman mythology, Pomona was the goddess of fruit trees. She scorned the love of Silvanus and Picus but married Vertumnus after he tricked her, disguised as an old woman. Her high priest was called the flamen Pomonalis[?]. The pruning knife was her attribute.
... add the square of b/(2a) to both sides, getting
<math>x^2+\frac{b}{a}x+\frac{b^2}{4a^2}=-\frac{c}{a}+\frac{b^2}{4a^2}.</math>
The left side is now a ...