The expression a2 + b2 is equivalent to

1.	The expression a2 + b2 is equivalent to
A.	(a + b)(a + b)
B.	(a + b)(a - b)
C.	(a + b)(a + b) - 2ab
D.	(a + b)(a - b) - 2ab
Answer» D. (a + b)(a - b) - 2ab

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