medium · GMAT Quant
A continuous pricing index f(x) is defined by f(x) = begincases x^2 + 4x + 7, & x ≥ 0 x^2 - 2x + 7, & x < 0 endcases.
What is the simplified expression for h(x) = f(x) - f(-x) for all x > 0?
- 2x
- 6x
- 2x^2 + 2x + 14
- x^2 + 6x
- 0
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