Exercise algebra.equations.quadratic.no-abc
Description
solve a quadratic equation without abc-formula
Derivation
25 == (x+7)^2
⇒ algebra.equations.coverup.power5 == x+7 or -5 == x+7
⇒ algebra.equations.coverup.onevar.plus-2 == x or -5 == x+7
⇒ algebra.equations.coverup.onevar.plus-2 == x or -12 == x
⇒ algebra.equations.linear.flipx == -2 or -12 == x
⇒ algebra.equations.linear.flipx == -2 or x == -12