Exercise algebra.equations.quadratic.no-abc

Description
solve a quadratic equation without abc-formula

Derivation

x*(x+12)-2*x^2 == 0

⇒ algebra.equations.linear.distr-times

x^2+12*x-2*x^2 == 0

⇒ algebra.equations.linear.merge

-x^2+12*x == 0

⇒ algebra.equations.quadratic.common-factor

-x*(x-12) == 0

⇒ algebra.equations.quadratic.product-zero

x == 0 or x == 12