Solve: $(3 m^{2} - 7) (4 n + 3 - 5 m^{2})$ .

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Solution

$\begin{matrix} \Rightarrow (3 m^{2} - 7) (4 n + 3 - 5 m^{2}) \Rightarrow 12 m^{2} n + 9 m^{2} - 15 m^{4} - 28 n - 21 + 35 m^{2} \Rightarrow 12 m^{2} n + 44 m^{2} - 15 m^{4} - 28 n - 21 \Rightarrow m^{2} (12 n + 44 - 15 m h 2) - 28 n - 21 \end{matrix}$

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