(n - 10)(n + 4)
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.04m2-n2=(.2m+n)(.2m-n)
-n(n + 10) or n(-n - 10)
The greatest common factor of the numbers 40 and 40 is 9.
8 is a factor of 40
The GCF of 10 and 40 is 10. 10 is a factor of 40, and 10 is the largest factor of itself, so 10 is the greatest common factor of 10 and 40.