Question

please give me the correct answer of this math.

Answer 1

${x}^{2} + \frac{1}{ {x}^{2} } = ({x + \frac{1}{x} })^{2} - 2 \\ = (\sqrt{7 } + \sqrt{6} + \sqrt{7} - \sqrt{6} ) ^{2} - 2 \\ = 2 { \sqrt[]{7} }^{2} - 2 \\ = 28 - 2 \\ = 26$
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