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August 21, 2014

August 21, 2014

Posted by **Anonymous** on Monday, January 28, 2013 at 1:16pm.

(x^2)sqrt(5x+6)dx

- Calc 2 -
**Steve**, Monday, January 28, 2013 at 4:48pm∫[0,1] x^2 √(5x+6) dx

That's almost x^5/2, but for that pesky 5x+6. So, let u=5x+6 and we have x = (u-6)/5:

∫[6,11] (u-6)^2/25 √u du/5

= 1/125 ∫[6,11] u^(5/2) - 12u^(3/2) + 36u^(1/2) du

= 1/125 (2/7 u^7/2 - 24/5 u^5/2 + 24u^3/2)[6,11]

= 2/4375 (576√6 - 1111√11)

= 1.03948

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