math. f.5

1.f(x)is divisible by x-1, to calculate f(x-1) can be divisible by what,sub (x-1)into x,then,we will know the result is x-2,which is the answer
2.p(x)≡(x+2)Q(x), we can ignore what Q(x) is since we don't know what Q(x) is,so we just need to fine something plus 2 equal to x-3since 'x' in p(x) is a variable. we know that x-3+2=x-1,so C is the answer