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.
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Count forward (positive) or backward (negative) in 3's and you will find all numbers that have 3 as a factor. -12, -9, -6, -3, 0, 3, 6, 9, 12 etc
negative 9
No, 9 is not a factor of 50.
Negative 18.
-9 x -8 = +72 negative x negative = positive