Yes, the factors for -15 are:
1, -15
3, -5
5, -3
15, -1
OR 1, 3, 5, 15, -1, -3, -5, -15
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Yes, technically, since -9 x -1 = 9 In general, we don't list negative factors of positive numbers. We do list negative factors of negative numbers.
Yes, technically, since -2 x -2 = 2. We generally don't use negative factors of positive numbers. We do list negative factors of negative numbers.
Sure. (-5) times (-7) = +35
Yes, technically, since -7 x -4 = 28. We do not generally list negative factors for positive numbers. We do list negative factors for negative numbers.
Yes. In multiplication, the product is positive if the factors have the same sign,and the product is negative if they have oppositesigns.