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b) (a2 +b2—2ab)(ab) = a3b + ab3 - 2a2b2 = ab ( a2 + b2 - 2ab )
c) (a2 -b2 +2ab)( ab ) = a3b - ab3 + 2a2b2 = ab (a2 - b3 +2ab2)
d) (x8—3x2 +1)( -3) = -3x8 + 9x2 - 3 = -x8 + 3x2 - 1 = x8 - 3x2 + 1
e) (a3—a+a2 )( a). = a4 - a2 + a3 = a2( a2 - 1 +a )