Exercise algebra.equations.quadratic.no-abc

Description
solve a quadratic equation without abc-formula

Derivation

x^2+9 == 4*x^2-6*x

⇒ algebra.equations.quadratic.move-left

-3*x^2+6*x+9 == 0

⇒ algebra.equations.quadratic.scale

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

⇒ algebra.equations.quadratic.nice-factors

(x+1)*(x-3) == 0

⇒ algebra.equations.quadratic.product-zero

x == -1 or x == 3