Exercise algebra.equations.quadratic.no-abc
Description
solve a quadratic equation without abc-formula
Derivation
x^2-12 == 0
⇒ algebra.equations.quadratic.no-linx^2 == 12
⇒ algebra.equations.coverup.powerx == sqrt 12 or x == -sqrt 12
⇒ algebra.equations.quadratic.simpler-sqrtx == 2*sqrt 3 or x == -2*sqrt 3