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Numbers & Operations

Calculate:  ${\left(\sqrt{\mathrm{<mn>9</mn>}+\mathrm{<msqrt><mn>77</mn></msqrt>}}+\sqrt{\mathrm{<mn>9</mn>}-\mathrm{<msqrt><mn>77</mn></msqrt>}}\right)}^2$

$\mathrm{<mn>18</mn>}$

$\mathrm{<mn>22</mn>}$

$\mathrm{<mn>4</mn>}$

$\mathrm{<mrow><mn>2</mn><mo></mo><msqrt><mn>77</mn></msqrt></mrow>}$

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