Mathematics 89 Online
OpenStudy (anonymous):

Use an appropriate method to evaluate each of the following indefinite integrals: A) the intergral of t^2 square root t^3 -1dt B) the intergral of square root (x)lnx dx PLEASE HELP Use an appropriate method to evaluate each of the following indefinite integrals: A) the intergral of t^2 square root t^3 -1dt B) the intergral of square root (x)lnx dx PLEASE HELP @Mathematics

OpenStudy (anonymous):

OpenStudy (anonymous):

For B set u=lnx and v=x^1/2 then use that substitution formula thing? I can't remember it...

OpenStudy (anonymous):

sorry I can't be much help here.

OpenStudy (anonymous):

Can someone please show the work out because I am just having problem on these few hw problems it will be of much help to me

OpenStudy (anonymous):

[-t^2/sqr root of 6( (t^3-1)^(1/2)) - t/6(sqrt(t^3-1)^5) - 5 / 8sqrt ((t^3-1)^7) + c]

OpenStudy (amistre64):

$\int \sqrt{x}\ ln(x)\ dx$ $\int\ (x)^{1/2}\ ln(x)\ dx$ $=\frac{2x^{3/2}\ ln(x)}{3}-\int\ \frac{2x^{3/2}}{3x}\ \ dx$ $=\frac{2x^{3/2}\ ln(x)}{3}-\frac{2}{3}\int\ x^{1/2}\ \ dx$

OpenStudy (anonymous):

someone please check i know its wrong

OpenStudy (amistre64):

i assume you can work it from there? :)

OpenStudy (amistre64):

$\int t\sqrt{t^3-1}dt$ this is the same process, you appear to be working on integration by parts

OpenStudy (amistre64):

the t goes down as you integrate up the sqrt part

OpenStudy (amistre64):

but the t^3 might prove tricky

OpenStudy (amistre64):

you sure that aint typoed?

OpenStudy (anonymous):

I must us integration by parts

OpenStudy (anonymous):

*use

OpenStudy (amistre64):

if we use the sqrt part for going under we get hopefully not a mess... $\int t\sqrt{t^3-1}dt$ $=\frac{t^2}{2}\sqrt{t^3-1}-\int \frac{t^2}{2}\frac{3t^2}{2\sqrt{t^3-1}}dt$ that is nasty

OpenStudy (anonymous):

May I see the full work out please

OpenStudy (amistre64):

this is the "full work out" as far as i can tell ... if not im sure you are capable of filling in the peices

OpenStudy (anonymous):

for the x square root problem

OpenStudy (anonymous):

I think I am missing parts that is why

OpenStudy (anonymous):

uv-integral vdu

OpenStudy (amistre64):

the only thing your missing, might be the u du v dv nonesense that is just organization

OpenStudy (amistre64):

.. and if your up to integration by parts and cant figure out the integral of x^(1/2) there aint much i can do for that ...

OpenStudy (anonymous):

No i know that

OpenStudy (anonymous):

use the tabular method

OpenStudy (amistre64):

the "t" one tho, i got no clue about yet

OpenStudy (amistre64):

$\int t\sqrt{t^3-1}dt$ $=t(\int' \sqrt{t^3-1}dt)-\int''(\sqrt{t^3-1}dt)$ that aint pretty ....

OpenStudy (anonymous):

Because my professor told me to use integration by parts for this one

OpenStudy (amistre64):

you sure it aint sqrt(t^2 -1) ??

OpenStudy (amistre64):
OpenStudy (amistre64):
OpenStudy (amistre64):

you aint got the talent to do the first one, and neither do i unless thats a sqrt(t^2-1)

OpenStudy (anonymous):

amistre what is the integral of sqrt[(t^3)-1]

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