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Evaluating Rational Functions
Let f(x)=x−x+\displaystyle {f{{\left({x}\right)}}}=\frac{{{x}-}}{{{x}+}}.
Enter your answers as a integers or reduced fractions
f()=\displaystyle {f{{()}}}=
f(−)=\displaystyle {f{{\left(-\right)}}}=
f(0)=\displaystyle {f{{\left({0}\right)}}}=
f(−)=\displaystyle {f{{\left(-\right)}}}=

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