4. If a and b are constants, the most general solution of the differential equation

\({d^2\over dt^2}+2{dt\over dx}+x=0\) is

(A) ae-t

(B) ae-t +bte-t

(C) aet +bte-t

(D) ae-2t

Hint: 
Explanation: 

Answer-(B) ae-t +bte-t
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