Answer
Refer to the blue graph below.
Work Step by Step
The parent function of $f(x)=|x|-3$ is the absolute value function $y=|x|$.
Graph the parent function $y=|x|$. (refer to the graph below).
RECALL:
The graph of the function $y=-f(x)$ involves a reflection across the x-axis of he parent function $y=f(x)$..
Thus, the function $f(x)=-|x|$ involves a reflection across the x-axis of the parent function $y=|x|$.
Reflect the graph of the parent across the x-axis. This can be done by changing they-value of each point to its opposite (e.g., the point (-2, 2) will be changed to (-2, -2), the point (2, 2) will be changed to (2, -2)).
Refer to the blue graph i the answer part above.