To complete the table for the function \( f(x) = 2x - 1 \), we need to calculate \( f(x) \) for each value of \( x \).
Here's the completed table:
\[ \begin{array}{|c|c|} \hline x & f(x) \ \hline 1 & 2(1) - 1 = 1 \ 2 & 2(2) - 1 = 3 \ 3 & 2(3) - 1 = 5 \ 4 & 2(4) - 1 = 7 \ \hline \end{array} \]
So the completed table is:
\[ \begin{array}{|c|c|} \hline x & f(x) \ \hline 1 & 1 \ 2 & 3 \ 3 & 5 \ 4 & 7 \ \hline \end{array} \]