Second order nonhomogeneous differential equation y '' + 2Y '+ y = (e ^ (- x)) / X Y '' + 2Y '+ y = (e ^ (- x)) / X

Second order nonhomogeneous differential equation y '' + 2Y '+ y = (e ^ (- x)) / X Y '' + 2Y '+ y = (e ^ (- x)) / X

∵ the characteristic equation of homogeneous equation y '' + 2Y '+ y = 0 is R & # 178; + 2R + 1 = 0, then r = - 1 (multiple roots) ∵ the general solution of the homogeneous equation is y = (c1x + C2) e ^ (- x) (C1, C2 are arbitrary constants). Therefore, according to the general solution of the homogeneous equation, let the solution of the original equation be y = (C1 (x) x + C2 (x)) e ^ (- x) (C1 (x), C2 (x) denote the solution of X