For any two real numbers a and b._x005F_x000D_ a-b2+b-a2Â is

1.	For any two real numbers a and b._x005F_x000D_ a-b2+b-a2Â is
A.	always zero
B.	never zero
C.	positive only if a â‰ b
D.	positive if an only if a > b
Answer» D. positive if an only if a > b

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