If by composition you mean multiplication of the functions f(x) and g(x) then
\(f(x) = g(x) = 5-2x^3\)
If by composition you mean addition of the functions f(x) and g(x) then
\(f(x) = 4x^6+25\)
\(g(x) = -20x^3\)
Note:- I have provided one set of solutions. Apparently, there are infinite number of solutions for this question
