Exercise algebra.equations.quadratic.no-abc

Description
solve a quadratic equation without abc-formula

Derivation

0 == x^2-7

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

7 == x^2

⇒ algebra.equations.coverup.power

sqrt 7 == x or -sqrt 7 == x

⇒ algebra.equations.linear.flip

x == sqrt 7 or -sqrt 7 == x

⇒ algebra.equations.linear.flip

x == sqrt 7 or x == -sqrt 7