Question

Find a third-order DE with the solutions:

y(sub1)=exp(x)
y(sub2)=exp(-x)

Answer 1

what is sub1?

Answer 2

\[y_{1}=exp(x)\]
\[y_{2}=\exp(-x)\]

Answer 3

(m-1)(m+1)(m + k) =0 <-- put any vale of k and replace m by D

Answer 4

Thank you @experimentX