Question 32438
Please help answer the following problem.  
(x+1)^3 - (x-1)^3
This is what we have so far:  (x+1)(x+1)(x+1) = x^3+3x^2+3x+1
However, we are confused about how to handle the subtration between the two expressions in parenthesis that needs to be cubed.  Please provide a detailed description, because we have several problems with this same format.

USE THE FORMULA 
A^3-B^3=(A-B)(A^2+AB+B^2).....YOU CAN MULTIPLY AND CHECK...SO WE GET....

TAKING A=X+1 AND B=X-1,WE GET   
(x+1)^3 - (x-1)^3={(X+1)-(X-1))*{(X+1)^2+(X+1)(X-1)+(X-1)^2}=
=(X+1-X+1)(X^2+1+2X+X^2-1+X^2+1-2X)
=2(3X^2-1)...IS THE ANSWER.