Exercise algebra.equations.quadratic.no-abc

Description
solve a quadratic equation without abc-formula

Derivation

25 == (x+7)^2

⇒ algebra.equations.coverup.power

5 == 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.flip

x == -2 or -12 == x

⇒ algebra.equations.linear.flip

x == -2 or x == -12