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SAT Math Practice Question #35871 - SATify | SATify
#35871
equations
functions
easy
30 sec
The function
f
is defined by
f
(
x
)
=
x
2
−
4
. For which value of
x
is
f
(
x
)
=
21
?
A.
3
B.
4
C.
5
D.
6
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