Let
f
(
x
)
=
x
+
2
x
+
7
\displaystyle {f{{\left({x}\right)}}}={\frac{{{x}+{2}}}{{{x}+{7}}}}
f
(
x
)
=
x
+
7
x
+
2
f
−
1
(
−
1
)
=
\displaystyle {{f}^{{-{1}}}{\left(-{1}\right)}}=
f
−
1
(
−
1
)
=
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\displaystyle
Enter your answer as a number (like 5, -3, 2.2172) or as a calculation (like 5/3, 2^3, 5+4)
Enter DNE for Does Not Exist, oo for Infinity