Find the product of $(3 m - 2 n^{2}) (- 7 m n)$

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Solution

$(3 m - 2 n^{2}) (- 7 m n) = (3 m - 2 n^{2}) \times (- 7 m n)$
$= (- 7 m n) \times (3 m - 2 n^{2})$
$= ((- 7 m n) \times 3 m) - ((- 7 m n) \times 2 n^{2})$
$= - 21 m^{2} n + 14 m n^{3}$

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