text: ### Home > CCA > Chapter 11 > Lesson 11.3.1 > Problem11-78
  
  11-78.
  
  If $f(x)=\frac{-5}{x+2}$ and $g(x)=(x−2)^3$, find each output value below (if possible). If it is not possible, explain why not. Homework Help ✎
  
  1. $f(−2)$
  
  Substitute $−2$ for $x$.
  
  Is it possible to divide by $0$?
  
  No solution.
  
  1. $g(−1)$
  
  Substitute $−1$ for $x$.
  $(x−2)^3$
  $(−1−2)^3$
  
  $−27$
  
  1. $g(4)$
  
  See the help for part (b).
  
  1. $f(−7)+g(1)$
  
  Substitute $−7$ for $x$ in $f(x)$ and $1$ for $x$ in $g(x)$,
  then add the results together.
  
  $1+(−1)=0$
  
  1. $f(3)−g(2)$
  
  See the help for part (d).