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