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Exponentials & Logarithms
hard
0:00.0
If
f
(
x
)
=
3
2
x
f(x) = 3^{2x}
f
(
x
)
=
3
2
x
, what is the value of
f
−
1
(
81
)
f^{-1}(81)
f
−
1
(
81
)
?
A
1
B
2
C
4
D
9
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