Exercise algebra.inequalities.quadratic

Description
solve a quadratic inequation

Derivation

-x^2-4*x+5 == 0

⇒ algebra.equations.quadratic.simpler-poly

x^2+4*x-5 == 0

⇒ algebra.equations.quadratic.nice-factors

(x-1)*(x+5) == 0

⇒ algebra.equations.quadratic.product-zero

x == 1 or x == -5