Exercise algebra.equations.quadratic.no-abc
Description
solve a quadratic equation without abc-formula
Derivation
8*x^2+4*x-24 == x^2-5*x-24
⇒ algebra.equations.quadratic.cancel8*x^2+4*x == x^2-5*x
⇒ algebra.equations.quadratic.move-left7*x^2+9*x == 0
⇒ algebra.equations.quadratic.common-factorx*(7*x+9) == 0
⇒ algebra.equations.quadratic.product-zerox == 0 or 7*x+9 == 0
⇒ algebra.equations.coverup.onevar.plusx == 0 or 7*x == -9
⇒ algebra.equations.coverup.timesx == 0 or x == -9/7