Reduction Formula for Primitive of Power of x by Power of a x + b/Decrement of Power of a x + b

Theorem

 * $\ds \int x^m \paren {a x + b}^n \rd x = \frac {x^{m + 1} \paren {a x + b}^n} {m + n + 1} + \frac {n b} {m + n + 1} \int x^m \paren {a x + b}^{n - 1} \rd x$