Exercise algebra.equations.quadratic.no-abc

Description
solve a quadratic equation without abc-formula

Derivation

100 == (x-1)^2

⇒ algebra.equations.coverup.power

10 == x-1 or -10 == x-1

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

11 == x or -10 == x-1

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

11 == x or -9 == x

⇒ algebra.equations.linear.flip

x == 11 or -9 == x

⇒ algebra.equations.linear.flip

x == 11 or x == -9