\[x = 1 \Longrightarrow \ \ \ \sqrt{1} = 1\]
\[x = 5 \Longrightarrow \ \ \ \ \ \ \sqrt{5} \approx 2,2\]
\[x = 7\ \Longrightarrow \ \ \ \ \ \ \sqrt{7} \approx 2,6\]
\[x = 9 \Longrightarrow \ \ \ \ \ \ \ \sqrt{9} = 3\]