Exercise algebra.inequalities.quadratic

Description
solve a quadratic inequation

Derivation

x^2-x > 12

⇒ algebra.inequalities.to-equation, clipboard=[ineq == (x^2-x > 12)]

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

⇒ algebra.inequalities.give-solution, clipboard=[]

x < -3 or x > 4