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# integration watch

1. I still have problem with this question :
Calculate [int from 0 to 1.6] x^3 [9-x^2]^3/2 dx
calculate similar question take a look:
[int from 0 to 6] x^3[9+x^2]^3/2dx
Thank you
2. Both of these integrals require a substitution method.
As an example, use u=9-x^2 for the first.
This thread would be better placed in the Academic Help - Maths forum.
3. Thank you i have moved the question to the math help room; but i think your u value is not right , other suggestions were u=3Sin[x],so if i get a different answer i'll letyou know!!
4. (Original post by zee22)
Thank you i have moved the question to the math help room; but i think your u value is not right , other suggestions were u=3Sin[x],so if i get a different answer i'll letyou know!!
Either way would work - there's often more than one substitution you can do.

In fact you may well find Gaz's method the easier of the two.

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Updated: February 3, 2006
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