Exercise algebra.equations.quadratic.no-abc

Description
solve a quadratic equation without abc-formula

Derivation

(x-1)^2 == 100

⇒ algebra.equations.coverup.power

x-1 == 10 or x-1 == -10

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

x == 11 or x-1 == -10

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

x == 11 or x == -9