Exercise algebra.equations.quadratic.no-abc
Description
solve a quadratic equation without abc-formula
Derivation
0 == x*(2*x-4)
⇒ algebra.equations.quadratic.product-zerox == 0 or 2*x-4 == 0
⇒ algebra.equations.coverup.onevar.minus-leftx == 0 or 2*x == 4
⇒ algebra.equations.coverup.timesx == 0 or x == 2