Exercise algebra.inequalities.quadratic

Description
solve a quadratic inequation

Derivation

-x^2+3*x+18 > 0

⇒ algebra.inequalities.to-equation, clipboard=[ineq == (-x^2+3*x+18 > 0)]

-x^2+3*x+18 == 0

⇒ algebra.equations.quadratic.simpler-poly

x^2-3*x-18 == 0

⇒ algebra.equations.quadratic.nice-factors

(x+3)*(x-6) == 0

⇒ algebra.equations.quadratic.product-zero

x == -3 or x == 6

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

-3 < x < 6