If the numerical values of (a-b)2 and (a+b)2 are equal then which of the following must be true?

If the numerical values of (a-b)2 and (a+b)2 are equal then which of t

1.	If the numerical values of (a-b)2 and (a+b)2 are equal then which of the following must be true?
A.	A + b = 0
B.	A - b = 0
C.	Ab = 0
D.	A = 1 / b
Answer» D. A = 1 / b