Composing Functions

A function tells you what to do with an argument.
  is the argument and  
  is the function which says ' multiply the argument by three then add two'.
Looking at functions this way is especially useful when composing functions.
\[f(x)=3x+2, \: g(x)=x^2+x\]

  means 'take the argument  
, multiply it by three then add two'.


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