Question: For each equation in Problems a to b, express the general solution of the nonhomogeneous DE a the sum of a particular solution (each is

For each equation in Problems a to b, express the general solution of the nonhomogeneous DE a the sum of a particular solution (each is a polynomial in t) and the general solution of the corresponding homogeneous DE.
a. y" + y' - 2y = 21 - 3
b. y" - 2y' + 2y = 4t - 6

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