Exercise algebra.equations.quadratic.no-abc

Description
solve a quadratic equation without abc-formula

Derivation

x^2-3*x+9/4 == 25/4

⇒ algebra.equations.quadratic.left-square

(x-3/2)^2 == 25/4

⇒ algebra.equations.coverup.power

x-3/2 == 5/2 or x-3/2 == -5/2

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

x == 4 or x-3/2 == -5/2

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

x == 4 or x == -1