Why is U raised to the -1/5 here in the second step?

I understand that the 4/5 came from bringing u^1/5 up so that -1/5 + 1 = 4/5, but I do not see where the -1/5 comes from.

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- February 24th 2009, 11:35 AMgammamanAnother Integration Question
Why is U raised to the -1/5 here in the second step?

I understand that the 4/5 came from bringing u^1/5 up so that -1/5 + 1 = 4/5, but I do not see where the -1/5 comes from.

- February 24th 2009, 11:36 AMChris L T521