Chorea are uncontrolled, purposeless, rapid and jerky movements of face and body. Frequently observed movements are facial grimacing, raising the shoulders and flexing and extending the fingers.
... called the roots of the equation. The formula reads
<math>
x=\frac{-b \pm \sqrt {b^2-4ac}}{2a}
</math>
The term b2 – 4ac is called the discriminant ...