Exercise algebra.inequalities.quadratic

Description
solve a quadratic inequation

Derivation

x^2-x == 12

⇒ algebra.equations.quadratic.move-left

x^2-x-12 == 0

⇒ algebra.equations.quadratic.nice-factors

(x+3)*(x-4) == 0

⇒ algebra.equations.quadratic.product-zero

x == -3 or x == 4