Hi guys! I'm kind of stuck in my review here in Quantitave on the Polynomial part 1. The problem statement, all variables and given/known data A. The first problem I had is Problem 7 on the link I will provide which has this. (x + y)3 + (x-y)3 = ? B. The second problem I had is Problem 8 on the same link I will provide which has this. x + 2xx-2 1 + 4 x2 - 4 Here is the link for proper viewing (sorry I'm still not quite familiar with the tools here in PF ): http://i.imgur.com/UyJXw2a.jpg?1 2. Relevant equations A. (x + y)3 = x3 + y3 = (x + y)(x2 - xy + y2) (x-y)3 = x3 - y3 = (x - y)(x2 + xy + y2) B. I'm sorry I have no idea about the equation on this one 3. The attempt at a solution When I tried answering it I got: A. 2x(2x2 + 2y2) And the answer key provided says that the answer is Choice A which is highlighted in yellow B. I'm sorry I have no idea how to solve this problem Please help me guys and if it's not too much trouble please show the solution Thanks!