medium · GMAT Quantitative Reasoning
The function f(x) is defined for all non-zero real numbers by f(x) = 3x^2 + 5x for x > 0 and f(x) = -3x^2 + 5x for x < 0.
For any negative real number x, which of the following expressions is equivalent to f(x) - f(-x)?
- -6x^2 + 10x
- 6x^2 - 10x,
- 0
- 10x
- -6x^2
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