(16-m ^ 2) ^ 2 + 4 √ m-2n / M + 4 = 0, find the value of √ Mn ^ 2 It's urgent

16-m^2=0,m-2n=0,m+4≠0
(4-m)(4+m)=0,m-2n=0,m≠-4
m=4,m=-4,m-2n=0,m≠-4
m=4,n=2
√mn^2=√4*2^2=4

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