This is hard to understand because it doesn't make sense. Quadratic polynomials (or more generally, algebraic expressions) are factored. Equations are not factored.
x^2 + 2x - 3 = 0 = (x+3)(x-1)
This is not factoring?
x^2 + 2x - 3 = 0 = (x+3)(x-1)
This is not factoring?