Exercise algebra.equations.quadratic.no-abc

Description
solve a quadratic equation without abc-formula

Derivation

6 == 4-x^2/10

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

-2 == x^2/10

⇒ algebra.equations.coverup.numerator

-20 == x^2

⇒ algebra.equations.coverup.power

false