Exercise algebra.equations.quadratic.no-abc

Description
solve a quadratic equation without abc-formula

Derivation

(x-7)^2+3 == 11

⇒ algebra.equations.coverup.onevar.plus

(x-7)^2 == 8

⇒ algebra.equations.coverup.power

x-7 == sqrt 8 or x-7 == -sqrt 8

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

x == 7+sqrt 8 or x-7 == -sqrt 8

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

x == 7+sqrt 8 or x == 7-sqrt 8

⇒ algebra.equations.quadratic.simpler-sqrt

x == 7+2*sqrt 2 or x == 7-2*sqrt 2