Exercise algebra.equations.quadratic.no-abc

Description
solve a quadratic equation without abc-formula

Derivation

x^2-x+1/4 == 121/4

⇒ algebra.equations.quadratic.left-square

(x-1/2)^2 == 121/4

⇒ algebra.equations.coverup.power

x-1/2 == 11/2 or x-1/2 == -11/2

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

x == 6 or x-1/2 == -11/2

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

x == 6 or x == -5