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Find-the-volume-of-the-region-bounded-by-the-elliptic-paraboloid-z-4-x-2-1-4-y-2-and-the-plane-z-0-




Question Number 144528 by imjagoll last updated on 26/Jun/21
Find the volume of the region   bounded by the elliptic paraboloid  z = 4−x^2 −(1/4)y^2  and the plane z=0
$$\mathrm{Find}\:\mathrm{the}\:\mathrm{volume}\:\mathrm{of}\:\mathrm{the}\:\mathrm{region}\: \\ $$$$\mathrm{bounded}\:\mathrm{by}\:\mathrm{the}\:\mathrm{elliptic}\:\mathrm{paraboloid} \\ $$$$\mathrm{z}\:=\:\mathrm{4}−\mathrm{x}^{\mathrm{2}} −\frac{\mathrm{1}}{\mathrm{4}}\mathrm{y}^{\mathrm{2}} \:\mathrm{and}\:\mathrm{the}\:\mathrm{plane}\:\mathrm{z}=\mathrm{0} \\ $$$$ \\ $$
Answered by EDWIN88 last updated on 03/Jul/21
vol = 4∫_0 ^( 2)  ∫_( 0) ^( 2(√(4−x^2 ))) (4−x^2 −(1/4)y^2 )dy dx         = 4∫_( 0) ^( 2) (4y−x^2 y−(1/4) (y^3 /3))_0 ^(2(√(4−x^2 ))) dx         = 16π
$$\mathrm{vol}\:=\:\mathrm{4}\int_{\mathrm{0}} ^{\:\mathrm{2}} \:\int_{\:\mathrm{0}} ^{\:\mathrm{2}\sqrt{\mathrm{4}−\mathrm{x}^{\mathrm{2}} }} \left(\mathrm{4}−\mathrm{x}^{\mathrm{2}} −\frac{\mathrm{1}}{\mathrm{4}}\mathrm{y}^{\mathrm{2}} \right)\mathrm{dy}\:\mathrm{dx} \\ $$$$\:\:\:\:\:\:\:=\:\mathrm{4}\int_{\:\mathrm{0}} ^{\:\mathrm{2}} \left(\mathrm{4y}−\mathrm{x}^{\mathrm{2}} \mathrm{y}−\frac{\mathrm{1}}{\mathrm{4}}\:\frac{\mathrm{y}^{\mathrm{3}} }{\mathrm{3}}\right)_{\mathrm{0}} ^{\mathrm{2}\sqrt{\mathrm{4}−\mathrm{x}^{\mathrm{2}} }} \mathrm{dx} \\ $$$$\:\:\:\:\:\:\:=\:\mathrm{16}\pi\: \\ $$

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