Just enter this in the calculator.

$${\mathtt{2}}{\mathtt{\,\times\,}}{\sqrt{{\mathtt{7}}}}{\mathtt{\,\times\,}}{\mathtt{2}}{\mathtt{\,\small\textbf+\,}}{\sqrt{{\mathtt{7}}}}{\mathtt{\,\times\,}}{\mathtt{2}} = {\mathtt{15.874\: \!507\: \!866\: \!387\: \!543\: \!5}}$$

or

$${\mathtt{2}}{\mathtt{\,\times\,}}{\sqrt{{\mathtt{7}}}}{\mathtt{\,\times\,}}{\mathtt{2}}{\mathtt{\,\small\textbf+\,}}{\mathtt{2}}{\mathtt{\,\times\,}}{\sqrt{{\mathtt{7}}}} = {\mathtt{6}}{\mathtt{\,\times\,}}{\sqrt{{\mathtt{7}}}}$$

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