5.5 The Substitution Rule/2

$\int x^{3}(2+x^{4})^{5}dx{\text{,}}\quad u=2+x^{4}$

$du=(4x^{3})\,dx$

${\frac {du}{4}}=x^{3}dx$

<math> \int x^3(2+x^4)^5dx = \int