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4 X -1 = -4 4 has the factors 1 , 4 and 2 and -2 as each will divide equally into 4 Not sure whether -1 only has -1 as a factor, I think it does as no negative number produces a negative result. -2 * -2 = 4 agreed. So I think the final answer is 1 , 2 , 4 , -2 and - 1 Regards, John O. Somewhere in the U.K.

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16y ago

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