Thread: Factoring the sum of cubes

Hi MHF,

Usually I can factor, but this particular problem is just killing me today. I have been trying to figure this out for over an hour...



I know two things...

I know I can immediatly factor out the 2 and take it down to .

And I know the answer is going to be in the form of

But for the life of me I cannot seem to find the proper middle terms to make it work.

Thanks in advance.

consider and

now make your problem into the form

Originally Posted by pickslides

consider and

now make your problem into the form

Yeah, that should have been obvious. After doing 3 hours of math, even the obvious things become so complicated.

I think it's time to break and brew some coffee! Thank you Pickslides.