1, -1, 3, -3, 9, -9
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No. Negative three squared is POSITIVE nine. The square of ANY number is positive, because if you multiply a negative number by a negative number, the result is positive.
It is minus ten.
1,2,4,5,10,20,25,50,100 9 factors in total.
NegativeIf the two factors have the same sign, their product is positive.If the two factors have different signs, their product is negative.
-4 +5 -5 + 4