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M²+n²+p²-3mn-3np-3mp+6mnp,if m=1,n=-2, and p=3.​

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 ➡{m}^{2}+{n}^{2}+{p}^{2}- 3mn + 6mnp \\ ( {1)}^{2}+ ( - 2) {}^{2}+ 3 {}^{2}- 3(1)( - 2) - 3( - 2)(3) \\ -3(1)(3) + 6(1)( - 2)(3) \\ 1 + 2 + 9 - 6 + 18 - 9- 36 \\ 12 - 6 + 9 - 36 \\ 6 - 27 \\21

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