C-03-Q148mediumsingle_mcqFactorize x3+2x2−5x−6x^3 + 2x^2 - 5x - 6x3+2x2−5x−6:a(x+1)(x+3)(x−2)(x+1)(x+3)(x-2)(x+1)(x+3)(x−2)b(x−1