Exercise algebra.equations.quadratic.no-abc
Description
solve a quadratic equation without abc-formula
Derivation
![](http://ideas.cs.uu.nl/images/external.png)
x^2-9*x+18 == 0
⇒ algebra.equations.quadratic.nice-factors(x-3)*(x-6) == 0
⇒ algebra.equations.quadratic.product-zerox == 3 or x == 6
Description
solve a quadratic equation without abc-formula