The plot below represents the function
f
(
x
)
\displaystyle {f{{\left({x}\right)}}}
f
(
x
)
1
2
3
4
5
-1
-2
-3
-4
-5
1
2
3
4
5
6
7
8
-1
-2
Solve
f
(
x
)
=
3
\displaystyle {f{{\left({x}\right)}}}={3}
f
(
x
)
=
3
2.7
-1
2
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