The sum of two monomials 2A ^ 5 ^ 2M and 4A ^ NB ^ 6 is still a monomial, m ^ 2-N ^ 2 = ()

A:
The sum of two monomials 2 (a ^ 5) (b ^ 2m) and 4 (a ^ n) (b ^ 6) is still a monomial
These two monomials are of the same kind
So:
n=5
2m=6
The solution is m = 3, n = 5
So: m ^ 2-N ^ 2 = 9-25 = - 16
So: m ^ 2-N ^ 2 = - 16

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