Hi Guys,

Nearly there with this problem, but need a nudge to the finish!

Prove that is a factor of and write down two other factors of the expression. Hence factorize the expression completely.

My solution,

Let,

Then since is a factor(Factor theorem)

And substituting , proves is a factor.

Similarly (a - b) and (c - a) are the other factors.

So by factor theorem,

How do I find out Factor 4?

Thanks for your help.