If 987 = 66, 765=83, 543=81, Then 321=?

$\\\text{For } 987=66 \\ \Rightarrow 9^{2}+7^{2}-8^{2}=81+49-64=66 \\ \rightarrow 66 \text{ reverse } 66 \\ \\\text{For }765=83 \\ \Rightarrow 7^{2}+5^{2}-6^{2}=49+25-36=38 \\ \rightarrow 38 \text{ reverse }83 \\ \\\text{For }543=81\\ \Rightarrow 5^{2}+3^{2}-4^{2}=25+9-16=18\\ \rightarrow 18 \text{ reverse }81 \\ \\\text{Similarly:} \text{For } 321=? \\ \Rightarrow 3^{2}+1^{2}-2^{2}=9+1-4=6 \\ \text{because 6 is a single digit number, so its reverse will be 6 .}$

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