Question

please answer the question​

Answer 1

Step-by-step explanation:

${r}^{2} + \frac{1}{ {r}^{2} } = 7 \\ (r + \frac{1}{r})^{2} = {r}^{2} + \frac{1}{ {r}^{2} } + 2 \\ r + \frac{1}{r} = \sqrt{7 + 2} \\ r + \frac{1}{r} = |3| \\ \\ (r - \frac{1}{r})^{2} = {r}^{2} + \frac{1}{ {r}^{2} } - 2 \\ r - \frac{1}{r} = | \sqrt{5} |$

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Answer 2

Answer:

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