Answer
Conclusion: The graph of $y=f(-x)$ is obtained by
reflecting the graph of $y=f(x)$ about the $y$-axis.
Work Step by Step
$y=\sqrt{-x}$ has the graph of $y=\sqrt{x},$
reflected about the $y$-axis.
$y=2(-x)+1$ has the graph of $y=2x=1$
reflected about the x-axis.
Conclusion: The graph of $y=f(-x)$ is obtained by
reflecting the graph of $y=f(x)$ about the $y$-axis.
