Answer:
reflects the right side of the graph across the y-axis
Explanation:
You want to know what f(|x|) does to a graph.
Reflection
A graph is reflected across the y-axis by changing the sign of x:
f(-x) reflects f(x) across the y-axis.
Absolute value
The absolute value function changes the sign of its argument when that argument is negative.
This means that the graph of f(|x|) will be a reflection of the graph of f(x) across the y-axis when x-values are negative.
The attachment shows an example.