La Spezia is a city in the Liguria region of northern Italy, at the head of La Spezia Gulf. It is one of major Italian military and commercial harbours, located between Genoa and Pisa on the Tyrrhenian Sea.
... (but see below for generalizations) with a being non-zero. These solutions are also called the roots of the equation. The formula reads
<math>
x=\frac{-b \pm \sqrt ...