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Problem
Problem
Let
f
:
R
→
R
f: R \rightarrow R
f
:
R
→
R
be defined by
f
(
x
)
=
2
x
+
∣
x
∣
f(x) = 2x + |x|
f
(
x
)
=
2
x
+
∣
x
∣
, then
f
(
2
x
)
+
f
(
−
x
)
−
f
(
x
)
=
f(2x) + f(-x) - f(x) =
f
(
2
x
)
+
f
(
−
x
)
−
f
(
x
)
=
(a)
2
x
2x
2
x
(b)
2
∣
x
∣
2|x|
2∣
x
∣
(c)
−
2
x
-2x
−
2
x
(d)
−
2
∣
x
∣
-2|x|
−
2∣
x
∣
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