Find the simplest value of 2 50 + 18 - 72 (given √2 = 1.414).

Answer: Option B

$$\begin{array}{rl}& 2\sqrt{50}+\sqrt{18}-\sqrt{72}\\ & \Rightarrow 2\times 5\sqrt{2}+3\sqrt{2}-6\sqrt{2}\\ & \Rightarrow 13\sqrt{2}-6\sqrt{2}\\ & \Rightarrow 7\sqrt{2}\\ & \Rightarrow 7\times 1.414\\ & \Rightarrow 9.898\end{array}$$