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13-08-2018
Mathematics

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Find the general solution of the differential equation. xy + y' = 138x

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Аноним Аноним

13-08-2018

use an integrating factor

y' + xy = 138x

I F = e ∫ xdx = e ^(x^2/2)

y' e^(x^2/2) + xy e^x^2/2 = 138x e^x^2/2

x y * e^x2/2 = 138∫x e^x^2/2 dx

xy * e ^(x^2/2) = 138 e^(x^2/2)

y = 138/ x + c

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