Exercise algebra.equations.quadratic.no-abc
Description
solve a quadratic equation without abc-formula
Derivation
10 == x-1 or -10 == x-1
⇒ algebra.equations.coverup.onevar.minus-left11 == x or -10 == x-1
⇒ algebra.equations.coverup.onevar.minus-left11 == x or -9 == x
⇒ algebra.equations.linear.flipx == 11 or -9 == x
⇒ algebra.equations.linear.flipx == 11 or x == -9