Exercise algebra.equations.quadratic.no-abc
Description
solve a quadratic equation without abc-formula
Derivation
x^2+2*x+1 == 5
⇒ algebra.equations.quadratic.left-square(x+1)^2 == 5
⇒ algebra.equations.coverup.powerx+1 == sqrt 5 or x+1 == -sqrt 5
⇒ algebra.equations.coverup.onevar.plusx == -1+sqrt 5 or x+1 == -sqrt 5
⇒ algebra.equations.coverup.onevar.plusx == -1+sqrt 5 or x == -1-sqrt 5