Exercise algebra.equations.quadratic.no-abc

Description
solve a quadratic equation without abc-formula

Derivation

3*x^2-2 == 25

⇒ algebra.equations.coverup.onevar.minus-left

3*x^2 == 27

⇒ algebra.equations.coverup.times

x^2 == 9

⇒ algebra.equations.coverup.power

x == 3 or x == -3