Factor x4+4x2+3x^4 + 4x^2 + 3x4+4x2+3 over the reals.
(x2+1)(x2+3)(x^2 + 1)(x^2 + 3)(x2+1)(x2+3)
(x2+2)2−1(x^2 + 2)^2 - 1(x2+2)2−1
Cannot be factored
(x+1)2(x+3)(x + 1)^2(x + 3)(x+1)2(x+3)