If x+1 is a factor of x4+(p−3)x3−(3p−5)x2+(2p−9)x+6, then which of the following is not the other factor?

Putting x=−1 , we get −6p+24=0 or p=4x4+x3−7x2−x+6    x4+x3−7x2−x+6=(x+1)x3−7x+6clearly x=1 satisfies x3-7x+6    =(x+1)(x−1)x2+x−6=(x+1)(x−1)(x+3)(x−2)  The other factors are x−1,x−2,x+3 .