Exercise algebra.equations.quadratic.no-abc

Description
solve a quadratic equation without abc-formula

Derivation

x^2-9*x+81/4 == 9/4

⇒ algebra.equations.quadratic.left-square

(x-9/2)^2 == 9/4

⇒ algebra.equations.coverup.power

x-9/2 == 3/2 or x-9/2 == -3/2

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

x == 6 or x-9/2 == -3/2

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

x == 6 or x == 3