Exercise algebra.equations.quadratic.no-abc
Description
solve a quadratic equation without abc-formula
Derivation
(x-9/2)^2 == 9/4
⇒ algebra.equations.coverup.powerx-9/2 == 3/2 or x-9/2 == -3/2
⇒ algebra.equations.coverup.onevar.minus-leftx == 6 or x-9/2 == -3/2
⇒ algebra.equations.coverup.onevar.minus-leftx == 6 or x == 3