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Mathematics 17 Online
OpenStudy (agreene):

Need some help evaluating an integral...

OpenStudy (agreene):

\[\int\int_E\int\sqrt{3x^2+3z^2}dV\] where E is the solid bounded by \(y=2x^2+2z^2\) and the plane \(y=8\)

OpenStudy (agreene):

not sure how to do the triple int notation in \(\LaTeX\) but you know what i mean

OpenStudy (rational):

\[\large \iiint \limits_{E} \sqrt{3x^2+3z^2}dV\]

OpenStudy (agreene):

indeed, thanks

OpenStudy (rational):

x^2+z^2 should hint you to switch to spherical/cylindrical

OpenStudy (agreene):

So, would I be correct in saying that the limits would be \[2x^2+2z^2\le y\le8 \\ 0\le r\le2 \\ 0\le \theta\le 2\pi\] ? if that's accurate I know what im doing lol

OpenStudy (rational):

thats right ! the projection in xz plane is a disk of radius 2

OpenStudy (agreene):

kay, i've got it from here.. the setup was causing me some issues lol.. thanks

OpenStudy (rational):

|dw:1407347759851:dw|

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