If
f
(
784
)
=
140
\displaystyle {f{{\left({784}\right)}}}={140}
f
(
784
)
=
140
, then find
f
−
1
(
140
)
\displaystyle {{f}^{{-{{1}}}}{\left({140}\right)}}
f
−
1
(
140
)
f
−
1
(
140
)
=
784
\displaystyle {{f}^{{-{{1}}}}{\left({140}\right)}}={784}
f
−
1
(
140
)
=
784
f
(
140
)
=
784
\displaystyle {f{{\left({140}\right)}}}={784}
f
(
140
)
=
784
x
=
784
\displaystyle {x}={784}
x
=
784
y
=
784
\displaystyle {y}={784}
y
=
784
784
\displaystyle {784}
784
f
−
1
(
784
)
=
140
\displaystyle {{f}^{{-{{1}}}}{\left({784}\right)}}={140}
f
−
1
(
784
)
=
140
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