Suppose that the functions f and g are defined for all real numbers x as follows, f ( x) =x+3 g (x) =4x+1 Write the expressions for ( f- g) (x ) and (f- g) (x) and evaluate (f+g) (4). ( f - =) (x) = ( f. =) (x ) - 0 X (f + = ) ( 4) - 0