medium · GMAT Quant
A chemical process control function f(x) is defined for non-zero thermal variance x by f(x) = 2x^3 + 5x^2 - x + 4 for x > 0 and f(x) = 2x^3 - 5x^2 - x - 4 for x < 0.
Which of the following expressions is equal to f(x) + f(-x) for all non-zero values of x?
- 10x^2 + 8
- 4x^3 - 2x
- 0
- 8
- 10x^2
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