Solution
Given that $$\sqrt{11 + 2\sqrt{18}}$$
$$\Rightarrow \sqrt{11 + 2 \times 3\sqrt{2}}$$
$$\Rightarrow \sqrt{11 + 6\sqrt{2}}$$
$$\Rightarrow \sqrt{11 + 6\times 1.44}$$
$$\Rightarrow \sqrt{11 + 8.64}$$
$$\Rightarrow \sqrt{19.64}$$
$$\Rightarrow 4.4142$$ = 4.4 Ans
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