Exercise algebra.equations.quadratic.no-abc
Description
solve a quadratic equation without abc-formula
Derivation
(x+3)^2 == 9
⇒ algebra.equations.coverup.powerx+3 == 3 or x+3 == -3
⇒ algebra.equations.coverup.onevar.plusx == 0 or x+3 == -3
⇒ algebra.equations.coverup.onevar.plusx == 0 or x == -6