Solve the given differential equation by undetermined coefficients.
y''' − 3y'' + 3y' − y = ex − x + 21

answer:

sometimes

*i think

step-by-step explanation:

because 1/3 is a fraction. we can tell because there is a divisor symbol between the 1 and the 3. if we were to add 2 fractions together, we would add the numerators, which is the number on top, but not the denominators, which is the number on the bottom

1/3+1/3=2/3

hope this !

c

-by-step explanation:

it would be c

hope this !

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