akl3644
Calculate an integral



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akl3644
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vf321
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Have you tried usub?

vf321
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try u = 9x^2

jamesHayek
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No, sub u=x^2

vf321
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I'm pretty sure mine still works... Both are fine...

akl3644
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my substitution become like this...

vf321
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Well you can trig sub if you want but that makes it needlessly complicated IMO.

akl3644
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emm what u suggest ?

vf321
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I told u. u = 9x^2.

vf321
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Do you know how to usub?

jamesHayek
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\[u=x^2; \frac{ 1 }{ 2 }du = xdx\]

vf321
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Again, either mine or james' work, since he keeps insisting....

jamesHayek
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you will get: \[\frac{ 1 }{ 2 }\int\limits_{0}^{1.6}(9u)^{3/2}u du\]

jamesHayek
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for the integrand \[(9u)^{3/2}u\] sub s=9u and ds=du

jamesHayek
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at this point you can expand the integrand and solve.

vf321
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@jamesHayek I msged you but I'll tell you again: We don't want to give them most of the problem.

jamesHayek
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vf321, this is a site to help. Not bicker. Show your work to help her.

vf321
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@jamesHayek help, not do homework for. But fine, this is not getting us anywhere. Let's stop arguing.

akl3644
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i am following ur step now. thx. trying to get the right answer

akl3644
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i will try both method