What is the deg(f-g)?

Let f(x) - x +2x+3 and g(x) =4x -5x+ 4x+1 For brevity let's write deg(p) for the degree of a polynomial p. So in the above example, deg(f) = 2 and deg(g) = 3. You can answer the following questions without actually computing the indicated functions. deg(f + g) 3 deg(f - 9) deg(fg) 5 deg( f o g) 6 deg(go f) 6