(x +1 )(2x - 2)(3x + 3) = ax3+bx2+cx+dax3+bx2+cx+d What are the values of a, b, c and d?  Choose the correct answer:
A) 2 B) 7 C) 6 D) 1 E) 9
(x + 1)(2x - 2)(3x + 3) = ax3+bx2+cx+dax3+bx2+cx+d   6(x + 1)(x - 1)(x + 1) = ax3+bx2+cx+dax3+bx2+cx+d   6(x2x2 - 1)(x + 1) = ax3+bx2+cx+dax3+bx2+cx+d   ⇒6(x3+x2−x−1)⇒6(x3+x2−x−1) = ax3+bx2+cx+dax3+bx2+cx+d   ⇒6x3+6x2−6x−6⇒6x3+6x2−6x−6 = ax3+bx2+cx+dax3+bx2+cx+d   Equating the coefficients of like learns on both the sides, a = 6, b = 6, c = -6 and d = -6.   Answer:6
<result>C</result>
(x +1 )(2x - 2)(3x + 3) = ax3+bx2+cx+dax3+bx2+cx+d What are the values of a, b, c and d?