A) $ f(x) $
B) $ 2f(x) $
C) $ -f(x) $
D) $ f(-x) $
Correct Answer: A
[a] $ f(x)=3x+| x | $
$ \therefore f(2x)-f(-x)-6x= $ $ 6x+| 2x |-3(-x)-| -x |-6x $ $ =3x+2| x |-| x |=3x+| x |=f(x) $
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