Take 5 out. If the missing signs are pluses, it becomes 5(n2 + 2n + 4)
If the missing signs are minuses, it becomes 5(n2 - 2n - 4)
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5(n2 + 2n + 4)
-n(n + 10) or n(-n - 10)
20 is not a factor of 30
Yes, because 4 times 5 equals 20. So 4 is a factor of 20.
the greatest common factor of 20 and 100 is:20