Ay(x)=y(x+1)-y(x-1)=
=C_(1)*e^(x+1)+C_(2)(x+1)*e^(x+1)+C_(3)(x+1)^2*e^(x+1))-
-C_(1)*e^(x-1)-C_(2)(x-1)*e^(x-1)-C_(3)(x-1)^2*e^(x-1))=
=e*C_(1)e^(x)+e*C_(2)xe^(x)+e*C_(2)e^(x)+
+e*C_(3)x^2e^(x)+2e*C_(3)xe^(x)+eC_(3)e^(x)-
-(1/e)C_(1)e^(x)-(1/e)C_(2)xe(x)+(1/e)C_(2)e^(x) -
-(1/e(C_(3)x^2e^(x)+(2/e)C_(3)xe^(x) - (1/e)C_(3)e^(x)=
=(eC_(1)+eC_(2)+eC_(3)-(1/e)C_(1)+(1/e)C_(2)-(1/e)C_(3))*e^(x)+
+(eC_(2)+2eC_(3)-(1/e)C_(2)+(2/e)C_(3))* x*e^(x) +
+(eC_(3) - (1/e) C_(3))*x^2e^(x)