Exercise algebra.equations.quadratic.no-abc

Description
solve a quadratic equation without abc-formula

Derivation

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

⇒ algebra.equations.linear.distr-times

2*x^2 == x^2+12*x

⇒ algebra.equations.quadratic.move-left

x^2-12*x == 0

⇒ algebra.equations.quadratic.common-factor

x*(x-12) == 0

⇒ algebra.equations.quadratic.product-zero

x == 0 or x == 12