Answer to Question #164796 in Calculus for faisal riaz

Question #164796

\int _1^2\int _2^3\int _0^1\:8xyzdzdxdy


1
Expert's answer
2021-02-24T06:07:41-0500

1223018xyzdzdxdy=\displaystyle\int\limits _1^2\int\limits _2^3\int\limits _0^1\:8xyz\:dzdxdy=


8122301xyzdzdxdy=\displaystyle8\int\limits _1^2\int\limits _2^3\int\limits _0^1\:xyz\:dzdxdy=


81223[01xyzdz]dxdy=\displaystyle8\int\limits _1^2\int\limits _2^3\left[\int\limits _0^1\:xyz\:dz\right]dxdy=


81223[xy01zdz]dxdy=\displaystyle8\int\limits _1^2\int\limits _2^3\left[xy\int\limits _0^1\:z\:dz\right]dxdy=


81223xy[01zdz]dxdy=\displaystyle8\int\limits _1^2\int\limits _2^3xy\left[\int\limits _0^1\:z\:dz\right]dxdy=


81223xy[z22]01dxdy=\displaystyle8\int\limits _1^2\int\limits _2^3xy\left[\frac{z^2}{2}\right]_0^1dxdy=


81223xy[122022]dxdy=\displaystyle8\int\limits _1^2\int\limits _2^3xy\left[\frac{1^2}{2}-\frac{0^2}{2}\right]dxdy=


81223xy12dxdy=\displaystyle8\int\limits _1^2\int\limits _2^3xy\cdot\frac{1}{2}\:dxdy=


8121223xydxdy=\displaystyle8\cdot\frac{1}{2}\int\limits _1^2\int\limits _2^3xy\:dxdy=


412[23xydx]dy=\displaystyle4\int\limits _1^2\left[\int\limits _2^3xy\:dx\right]dy=


412[y23xdx]dy=\displaystyle4\int\limits _1^2\left[y\int\limits _2^3x\:dx\right]dy=


412y[23xdx]dy=\displaystyle4\int\limits _1^2y\left[\int\limits _2^3x\:dx\right]dy=


412y[x22]23dy=\displaystyle4\int\limits _1^2y\left[\frac{x^2}{2}\right]_2^3\:dy=


412y[322222]dy=\displaystyle4\int\limits _1^2y\left[\frac{3^2}{2}-\frac{2^2}{2}\right]\:dy=


412y[942]dy=\displaystyle4\int\limits _1^2y\left[\frac{9-4}{2}\right]\:dy=


412y52dy=\displaystyle4\int\limits _1^2y\cdot\frac{5}{2}\:dy=


45212ydy=\displaystyle4\cdot\frac{5}{2}\int\limits _1^2y\:dy=


1012ydy=\displaystyle10\int\limits _1^2y\:dy=


10[y22]12=\displaystyle10\left[\frac{y^2}{2}\right]_1^2=


10[222122]=\displaystyle10\cdot\left[\frac{2^2}{2}-\frac{1^2}{2}\right]=


10412=\displaystyle10\cdot\frac{4-1}{2}=


1032=\displaystyle10\cdot\frac{3}{2}= 1515


Answer:

1223018xyzdzdxdy=15\displaystyle\int\limits _1^2\int\limits _2^3\int\limits _0^1\:8xyz\:dzdxdy=15


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