6n2 + 16n can be factorised to give 2n(3n + 8) so the highest factor is 2n.
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m2 - 4mn - 12n2 = m2 - 6mn + 2mn - 12n2 = m(m - 6n) + 2n(m - 6n) = (m + 2n)(m - 6n)
6n = 12 n = 2
-5=6n+7 -5-7=6n+7-7 -12=6n -12/6=6n/6 -2=n
11m + 6n - 2m + 9n = 9m + 15n or 3(3m + 5n)
m^2 6n - 9n2 - 2m = (m - 3n)(m + 3n - 2)