Exercise algebra.equations.quadratic.no-abc
Description
solve a quadratic equation without abc-formula
Derivation
81 == 9*x^2
⇒ algebra.equations.coverup.times9 == x^2
⇒ algebra.equations.coverup.power3 == x or -3 == x
⇒ algebra.equations.linear.flipx == 3 or -3 == x
⇒ algebra.equations.linear.flipx == 3 or x == -3