It is not factorable. Factors of 21 are. 21 and 1
7 and 3. None of those add up to 12
Answer and expl
anation is in a file. Li
nk below. Good luck!
bit.
ly/3a8Nt8n
Substitute
, so that
. Then the ODE is equivalent to

which is separable as

Split the left side into partial fractions,

so that integrating both sides is trivial and we get








Given the initial condition
, we find

so that the ODE has the particular solution,

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