# Calculus question U subs integral?

∫ 15r^4 dr/sqrt(2-r^5),u=2-r^5

### 2 Answers

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- rotchmLv 74 weeks ago
u = 2 - r^5 --> du = -5 r^4 dr.

So your integrand is now: 15 * (du / -5) / √u. You can simplify this a little further.

Note that up to this point, it was just highschool algebra!

Then integrate since its of the form uⁿ.

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