medium · GMAT Quant
A cost function C(x) for net export balance x ≠ 0 is defined as:
C(x) = begincases 2|x| + 5x, & if x > 0 2|x| - 5x, & if x < 0 endcases
Which of the following is the simplified form of C(x) - C(-x) for all x ≠ 0?
- 10x
- 4x
- 0
- 14x
- 4|x|
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