2008-09-23, 12:12 AM
argh I dont get it 
I looked in the back of the book and the answer is supposed to be 4ab(3a^2 + b^2)(a^2 + 3b^2)
but I dont understand how they got it!
I looked in the back of the book and the answer is supposed to be 4ab(3a^2 + b^2)(a^2 + 3b^2) but I dont understand how they got it!