please help me with this

4.2 Let f(x) = x3 - 12:2 + 48x 62 and let g(x) = {/x 2 + 4. 4.2.1 Find a and I) such that x) can be written as f(x) = (x + a)3 - b. Hint: Use the fact that (x + (1)3 = x3 + Flaxz + 3:121: + a3 4.2.2 Find (f a g)(x) and (g :- f)(x). What can you conclude about f and g