Exercise algebra.equations.quadratic.no-abc

Description
solve a quadratic equation without abc-formula

Derivation

x^2+4*x+4 == 4

⇒ algebra.equations.quadratic.left-square

(x+2)^2 == 4

⇒ algebra.equations.coverup.power

x+2 == 2 or x+2 == -2

⇒ algebra.equations.coverup.onevar.plus

x == 0 or x+2 == -2

⇒ algebra.equations.coverup.onevar.plus

x == 0 or x == -4