Exercise algebra.equations.quadratic.no-abc
Description
solve a quadratic equation without abc-formula
Derivation
x^2-12*x+36 == 2
⇒ algebra.equations.quadratic.left-square(x-6)^2 == 2
⇒ algebra.equations.coverup.powerx-6 == sqrt 2 or x-6 == -sqrt 2
⇒ algebra.equations.coverup.onevar.minus-leftx == 6+sqrt 2 or x-6 == -sqrt 2
⇒ algebra.equations.coverup.onevar.minus-leftx == 6+sqrt 2 or x == 6-sqrt 2