Exercise algebra.equations.quadratic.no-abc

Description
solve a quadratic equation without abc-formula

Derivation

x^2-12*x+34 == 0

⇒ algebra.equations.quadratic.prepare-split

x^2-12*x+36 == 2

⇒ algebra.equations.quadratic.left-square

(x-6)^2 == 2

⇒ algebra.equations.coverup.power

x-6 == sqrt 2 or x-6 == -sqrt 2

⇒ algebra.equations.coverup.onevar.minus-left

x == 6+sqrt 2 or x-6 == -sqrt 2

⇒ algebra.equations.coverup.onevar.minus-left

x == 6+sqrt 2 or x == 6-sqrt 2