easy · GMAT Quant
A network traffic capacity function f(x) is defined for all real numbers x by f(x) = x|x| + 4x.
Which of the following expressions is equivalent to f(x) - f(-x) for all real numbers x?
- 2x|x| + 8x
- 0
- 8x
- 2x|x|
- -2x|x| - 8x
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