Friday, 22 November 2013

Integration by substitution, but I cannot see how

I am trying to find an indefinite integral. The question suggests that it can be solved with integration by substitution, but I cannot see how. Multiplying out the brackets and integrating gives an eight-order result. Can anyone help here?




$$
\int \left(x+4\right)\left(\frac{1}{3}x+8\right)^6\:dx
$$

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