Exercise algebra.inequalities.quadratic

Description
solve a quadratic inequation

Derivation

0 == x^2-6*x-16

⇒ algebra.equations.linear.flip

x^2-6*x-16 == 0

⇒ algebra.equations.quadratic.nice-factors

(x+2)*(x-8) == 0

⇒ algebra.equations.quadratic.product-zero

x == -2 or x == 8