Question

[3m+2n]square-[4m-5n]square

Answer 1

$= {(3m + 2n)}^{2} - ({4m - 5n})^{2} \\ = 9 {m}^{2} + 4 {n}^{2} + 12mn - 16 {m}^{2} - 25 {n}^{2} + 40mn \\ = - 7 {m}^{2} - 21 { n}^{2} + 52mn$

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