easy · GMAT Quant
A digital signal processor uses a piecewise function f(x) where f(x) = x^2 for x ≥ 0, and f(x) = -x^2 for x < 0.
Which of the following is equal to f(-x) for all real numbers x?
- -f(x)
- f(x)
- (f(x))^2
- f(x) + 1
- 0
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