Integrate by substitution.

Answer

We have

*u* = (2*x*^{2} + 4*x*)

*du* = (4*x* + 4)*dx*

It doesn't look like there's a factor of (4*x* + 4) in the integrand. However, (4*x* + 4) is the same thing as 4(*x* + 1). If we factor 60 into 15 ⋅ 4, we can see where the substitution happens: