For P(x)=x4−2x3−7x2+8x+12P(x) = x^4 - 2x^3 - 7x^2 + 8x + 12P(x)=x4−2x3−7x2+8x+12, given that x=3x = 3x=3 is a double root, factor P(x)P(x)P(x) completely.
(x−3)2(x+2)(x+2)(x-3)^2(x+2)(x+2)(x−3)2(x+2)(x+2)
(x−3)2(x2+4x+4)(x-3)^2(x^2+4x+4)(x−3)2(x2+4x+4)
(x−3)2(x+2)(x−2)(x-3)^2(x+2)(x-2)(x−3)2(x+2)(x−2)
(x−3)2(x2−4)(x-3)^2(x^2-4)(x−3)2(x2−4)