Exercise algebra.equations.quadratic.no-abc
Description
solve a quadratic equation without abc-formula
Derivation
![](http://ideas.cs.uu.nl/images/external.png)
4*x^2-6*x == x^2+9
⇒ algebra.equations.quadratic.move-left3*x^2-6*x-9 == 0
⇒ algebra.equations.quadratic.scalex^2-2*x-3 == 0
⇒ algebra.equations.quadratic.nice-factors(x+1)*(x-3) == 0
⇒ algebra.equations.quadratic.product-zerox == -1 or x == 3