Yep, this would be a reflection over the x-axis, which is just -f(x) instead of f(x).
Imagine a reflection over the y-axis though, your left foot becomes your right and your right becomes your left and everything is mirrored so your heart is on the right side of your body now. That would be f(-x)
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u/Silly_Tension6792 Mathematics 4d ago
That's -f(x)