Changes

x = \frac{2c}{-b \pm \sqrt{b^2 - 4ac}}

x = \frac{2c}{-b \pm \sqrt{b^2 - 4ac}}

</math>

</math>

This formula is useful when ''a'' is small.

This formula is sometimes called the "Citardauq formula" to distinguish it from the usual quadratic formula and is useful when ''a'' is small.

===Numerical methods===

===Numerical methods===