If lal = b, is a+b > ab

1) a= -b
2) a= -3

answer is D.

Explanation
1) a + b = 0, and ab is negative
2) a + b = 0, and ab = -9

My thought when answering this question was that a and b could both = 0. Could someone explain to me why this is not possible? Is it because in 1) you are told that a=-b and that when dealing with zero it cannot have a sign? Therefore 0 does not = -0?

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