Exercise algebra.equations.quadratic.no-abc
Description
solve a quadratic equation without abc-formula
Derivation
x^2+8/3*x-1 == 0
⇒ algebra.equations.quadratic.prepare-splitx^2+8/3*x+16/9 == 25/9
⇒ algebra.equations.quadratic.left-square(x+4/3)^2 == 25/9
⇒ algebra.equations.coverup.powerx+4/3 == 5/3 or x+4/3 == -5/3
⇒ algebra.equations.coverup.onevar.plusx == 1/3 or x+4/3 == -5/3
⇒ algebra.equations.coverup.onevar.plusx == 1/3 or x == -3