Exercise algebra.equations.quadratic.no-abc
Description
solve a quadratic equation without abc-formula
Derivation
0 == x^2-x-30
⇒ algebra.equations.linear.flipx^2-x-30 == 0
⇒ algebra.equations.quadratic.nice-factors(x+5)*(x-6) == 0
⇒ algebra.equations.quadratic.product-zerox == -5 or x == 6