Using function concepts, it is found that the correct option is given by:
D. The function is negative when x<0
How the sign of a function is determined?
- If the graph is above the x-axis, it is positive.
- If the graph is below the x-axis, it is negative.
In this problem, the graph of the function is the red line, and:
- For values of x < 0, the function is below the x-axis, hence it is negative.
- For values of x > 0, the function is above the x-axis, hence it is positive.
Thus, option D is correct.
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