Using u=x2+5u=x^2+5u=x2+5, what is ∫2x(x2+5)3dx\int 2x(x^2+5)^3 dx∫2x(x2+5)3dx equivalent to?
∫u3du\int u^3 du∫u3du
∫2u3du\int 2u^3 du∫2u3du
∫1u3du\int \frac{1}{u^3} du∫u31du
∫u4du\int u^4 du∫u4du