Find INTERGRAL roots of

let the given poly be p(x)

now,

 take factors of the constant term i.e. -6

they are

1, -1, 2, -2 , 3, -3, 6, -6

find

p(1)

it's =0

so

simly

p(2)=0

p(3)=0

so the integral roots are

1,2,3

 

now divide p(x) by x-1