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    I still have problem with this question :
    I'm stuck i dont know why please help and clerify some steps to do by hand
    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
    please help
    Thank you
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    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.
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    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!!
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    (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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