Exercise algebra.equations.quadratic.no-abc
Description
solve a quadratic equation without abc-formula
Derivation
0 == -x^2+5*x
⇒ algebra.equations.linear.flip-x^2+5*x == 0
⇒ algebra.equations.quadratic.common-factor-x*(x-5) == 0
⇒ algebra.equations.quadratic.product-zerox == 0 or x == 5