Please help with this question.

Suppose that the functions f and g are defined for all real numbers x as follows. f ( x) =x-2 g (x) =4x2 Write the expressions for (f+ g) (x) and (f-g) (x) and evaluate (fg) (3). ( f + 8) (x ) = 0 ( f - 8) (x ) = 0 X 5 ( f.8) (3 ) = 0