Using the given values in the equation and calculating the value of D, we have:
[tex]\begin{gathered} D=\sqrt[]{2(x_2-x_1)^2+4(y_2-y_1)^2} \\ D=\sqrt[]{2(8-4)^2+4(16-5)^2} \\ D=\sqrt[]{2\cdot4^2+4\cdot11^2} \\ D=\sqrt[]{2\cdot16+4\cdot121} \\ D=\sqrt[]{32+484} \\ D=\sqrt[]{516} \\ D=22.7156 \end{gathered}[/tex]
