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Functions
medium
0:00.0
If
f
(
x
)
=
2
x
+
1
f(x) = 2x+1
f
(
x
)
=
2
x
+
1
and
f
(
a
)
=
9
f(a) = 9
f
(
a
)
=
9
, find
a
a
a
.
A
4
B
5
C
19
D
17
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