1) Let f(x) = x^3 - kx^2 +2kx - k - 1

a) Show that f(x) is divisible by x-1, well thats obvious f(1) = 0

but then there is part b - factorise it.

I know how to do it when there is a number, but its confusing when there is a pronumeral, how do i go about this. Specifically the "long division" method.

Also, any tips and hints for when you are solving a worded question?

Cheers