Solution
$$\sqrt{9-2\sqrt{11-6\sqrt{2}}}$$
As per the given data,
$$\Rightarrow 6\sqrt{2}=6\times 1.414=8.484$$
Now, $$\sqrt{9-2\sqrt{11-8.484}}$$
$$\Rightarrow \sqrt{9-2\sqrt{2.526}}$$
$$\Rightarrow \sqrt{9-2\times 1.589}=2.4$$
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