Exercise algebra.equations.quadratic.no-abc
Description
solve a quadratic equation without abc-formula
Derivation
7 == x^2
⇒ algebra.equations.coverup.powersqrt 7 == x or -sqrt 7 == x
⇒ algebra.equations.linear.flipx == sqrt 7 or -sqrt 7 == x
⇒ algebra.equations.linear.flipx == sqrt 7 or x == -sqrt 7