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+2*x == 8
⇒ algebra.equations.quadratic.move-leftx^2+2*x-8 == 0
⇒ algebra.equations.quadratic.nice-factors(x-2)*(x+4) == 0
⇒ algebra.equations.quadratic.product-zerox == 2 or x == -4