$$\left. \begin{array} { l } { ( x + 4 ) ( x - 4 ) } \\ { ( m + n - 1 ) ^ { 2 } } \end{array} \right.$$
$\left(x^{2}-16\right)\left(m+n-1\right)^{2}$
$$x^{2}-16=\left(x-4\right)\left(x+4\right)$$
$$\left(x-4\right)\left(x+4\right)\left(m+n-1\right)^{2}$$
$$m^{2}x^{2}+n^{2}x^{2}+2mnx^{2}-2mx^{2}-2nx^{2}+x^{2}-32mn-16m^{2}-16n^{2}+32m+32n-16$$
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$x^{2}-16,\ \left(m+n-1\right)^{2}$
