Based on the given equations, f composite of g of x is equal to the function f(x) with g(x) being substituted to the value of x. In other words, the degree of the function can be determined by substituting to;
f(g(x)) = 2(x2-1)^5 +3
= 2(x^10 - 1) + 3
Therefore, the degree of the composite is 10