Final answer:
The equation for reflecting the graph of f(x) = [x] across the x-axis is g(x) = -[x].
Step-by-step explanation:
The equation for reflecting the graph of f(x) = [x] across the x-axis is g(x) = -[x].
When reflecting a graph across the x-axis, each point on the original graph will have the same x-coordinate but a negated y-coordinate.
For example, if the original graph has a point (2, 3), the reflected graph will have a corresponding point (2, -3).