Exercise algebra.equations.quadratic.no-abc
Description
solve a quadratic equation without abc-formula
Derivation
![](http://ideas.cs.uu.nl/images/external.png)
2*x == -1+sqrt 6 or 2*x+1 == -sqrt 6
⇒ algebra.equations.coverup.timesx == (-1+sqrt 6)/2 or 2*x+1 == -sqrt 6
⇒ algebra.equations.coverup.onevar.plusx == (-1+sqrt 6)/2 or 2*x == -1-sqrt 6
⇒ algebra.equations.coverup.timesx == (-1+sqrt 6)/2 or x == (-1-sqrt 6)/2
⇒ algebra.equations.quadratic.distr-divx == -1/2+sqrt 6/2 or x == -1/2-sqrt 6/2