Exercise algebra.equations.quadratic.no-abc
Description
solve a quadratic equation without abc-formula
Derivation
![](http://ideas.cs.uu.nl/images/external.png)
0 == (3*x-1)*(x+3)
⇒ algebra.equations.quadratic.product-zero3*x-1 == 0 or x == -3
⇒ algebra.equations.coverup.onevar.minus-left3*x == 1 or x == -3
⇒ algebra.equations.coverup.timesx == 1/3 or x == -3