A) \[f(x)\]
B) \[2f(x)\]
C) \[-f(x)\]
D) \[f(-x)\]
Correct Answer: A
Solution :
[a] \[f(x)=3x+\left| x \right|\] \[\therefore f(2x)-f(-x)-6x=\] \[6x+\left| 2x \right|-3(-x)-\left| -x \right|-6x\] \[=3x+2\left| x \right|-\left| x \right|=3x+\left| x \right|=f(x)\]You need to login to perform this action.
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