=((A+B)^2)-2AB)^2-2A^2B^2
=( 16-4)^2-2*4= 144-8= 136
2.X^2=X+ 1
-X^3+2X^2+2007=-X(X^2-2X)+2007
=-x( 1-x)+2007=x^2-x+2007= 1+2007=2008
3. Original formula = (3a-2) [(a-1) 2-1]
=(3A-2)[(A- 1- 1)(A- 1+ 1)]
=(3A-2)(A-2)A
Original formula =(A-B-C)(A+B-C)+(A-B-C)(B-C-A)
= 2(A-B- Canada)