Exercise algebra.inequalities.quadratic
Description
solve a quadratic inequation
Derivation
![](http://ideas.cs.uu.nl/images/external.png)
x^2+9*x == 3*x-5
⇒ algebra.equations.quadratic.move-leftx^2+6*x+5 == 0
⇒ algebra.equations.quadratic.nice-factors(x+1)*(x+5) == 0
⇒ algebra.equations.quadratic.product-zerox == -1 or x == -5