0 votes 0 votes If $a$ and $b$ are constants, the most general solution of the differential equation $$\frac{d^2x}{dt^2}+2 \frac{dx}{dt}+x=0$$ is $ae^{-t}$ $ae^{-t} + bte^{-t}$ $ae^t+bte^{-t}$ $ae^{-2t}$ Differential Equations gate2014-ec-4 differential-equations + – Milicevic3306 asked Mar 26, 2018 retagged Feb 26, 2021 by Lakshman Bhaiya Milicevic3306 16.0k points 74 views answer comment Share Follow See all 0 reply Please log in or register to add a comment.