a2 – 2ab + b2
X8 – 2X4 – 80
16 + 40x2 + 25x4
3X2 – 5X – 2
X4 + 5X2 + 4
X6 – 6X3 – 7
( X3 – 7 ) ( X3 + 1)
( X – 2) ( 3X + 1)
(X4 – 10) ( X4 + 8)
(4 + 5x2)2
(a – b) 2
( X2 + 4) ( X2 + 1)
