Exercise algebra.equations.quadratic.no-abc
Description
solve a quadratic equation without abc-formula
Derivation
![](http://ideas.cs.uu.nl/images/external.png)
-3+sqrt 6 == 2*x or -sqrt 6 == 2*x+3
⇒ algebra.equations.coverup.times(-3+sqrt 6)/2 == x or -sqrt 6 == 2*x+3
⇒ algebra.equations.coverup.onevar.plus(-3+sqrt 6)/2 == x or -3-sqrt 6 == 2*x
⇒ algebra.equations.coverup.times(-3+sqrt 6)/2 == x or (-3-sqrt 6)/2 == x
⇒ algebra.equations.linear.flipx == (-3+sqrt 6)/2 or (-3-sqrt 6)/2 == x
⇒ algebra.equations.linear.flipx == (-3+sqrt 6)/2 or x == (-3-sqrt 6)/2
⇒ algebra.equations.quadratic.distr-divx == -3/2+sqrt 6/2 or x == -3/2-sqrt 6/2