Exercise algebra.equations.quadratic.no-abc
Description
solve a quadratic equation without abc-formula
Derivation
![](http://ideas.cs.uu.nl/images/external.png)
x == (-4+sqrt 80)/4 or x == (-4-sqrt 80)/4
⇒ algebra.equations.quadratic.simpler-sqrtx == -1+sqrt 5 or x == -1-sqrt 5
Description
solve a quadratic equation without abc-formula