Exercise algebra.equations.quadratic.no-abc

Description
solve a quadratic equation without abc-formula

Derivation

x^2 == 2/5

⇒ algebra.equations.coverup.power

x == sqrt (2/5) or x == -sqrt (2/5)

⇒ algebra.equations.quadratic.simpler-sqrt

x == 1/5*sqrt 10 or x == -1/5*sqrt 10