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f(x ) = 3X -1     g( x ) = X^2 +4
 
  ( f +g) ( -2 )= [( 3(-2)  -1 +(-2^2)  + 4] =
                     = ( -6 - 1 +4 +4 ) = 1
 
  ( f - g ) ( -2) = [ 3(-2) -1 - ( -2^2 +4 ) ]=
                     = ( -7 -8) = -15
 
  (f ° g ) (-2 ) = [ 3 (-2^2 + 4) - 1 ] =
 
                    =  3( 8) - 1 = 23