We have found the following particular solution and its derivatives. = Ax² + Bx + C + (DX + E)ex Yp = 2AX + B + (Dx + E)ex + Dex = 2A + (DX + E)ex + 2Dex "p Substituting into the original differential equation results in the following. y" - 8y' + 20y = 200x278xex (2A + (DX + E)ex + 2Dex) − 8(2Ax + B + (Dx + E)ex + Dex) + 20(Ax² + Bx + C + (Dx + E)ex) = 200x² - 78xex Simplifying the left side of this equation gives the following. (2A + (Dx + E)ex + 2Dex) - 8(2Ax + B + (Dx + E)e* + Dex) + 20(Ax² + Bx + C + (Dx + E)ex) = (2A - 8B + 20C) + (-16A + 20B)x+ (-6D + 13E)ex + AX² As the coefficients of the terms in this simplified expression must be equal to the coefficients of 200x278xex, we have the following system. 2A8B20C = 0 -16A + 20B = 0 -6D + 13E = 0 = -78 = 200 Dxex +
We have found the following particular solution and its derivatives. = Ax² + Bx + C + (DX + E)ex Yp = 2AX + B + (Dx + E)ex + Dex = 2A + (DX + E)ex + 2Dex "p Substituting into the original differential equation results in the following. y" - 8y' + 20y = 200x278xex (2A + (DX + E)ex + 2Dex) − 8(2Ax + B + (Dx + E)ex + Dex) + 20(Ax² + Bx + C + (Dx + E)ex) = 200x² - 78xex Simplifying the left side of this equation gives the following. (2A + (Dx + E)ex + 2Dex) - 8(2Ax + B + (Dx + E)e* + Dex) + 20(Ax² + Bx + C + (Dx + E)ex) = (2A - 8B + 20C) + (-16A + 20B)x+ (-6D + 13E)ex + AX² As the coefficients of the terms in this simplified expression must be equal to the coefficients of 200x278xex, we have the following system. 2A8B20C = 0 -16A + 20B = 0 -6D + 13E = 0 = -78 = 200 Dxex +
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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