5(n - 2)
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mn - 4m - 5n + 20 = (mn - 5n) - (4m - 20) = n(m - 5) - 4(m - 5) = (m -5)(n - 4)
n = 70/5 n = 14
The GCF is 5n
40n^2 + 64n = n(40n + 64) = 8n(5n + 8)
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.