If \[f:R\to R\] is defined by \[f(x)=3x+\left| x \right|,\] then\[f(2x)-f(-x)-6x=\]

If \[f:R\to R\] is defined by \[f(x)=3x+\left| x \right|,\] then\[f(2x

1.	If \[f:R\to R\] is defined by \[f(x)=3x+\left\| x \right\|,\] then\[f(2x)-f(-x)-6x=\]
A.	\[f(x)\]
B.	\[2f(x)\]
C.	\[-f(x)\]
D.	\[f(-x)\]
Answer» B. \[2f(x)\]

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If \[f:R\to R\] is defined by \[f(x)=3x+\left| x \right|,\] then\[f(2x)-f(-x)-6x=\]

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