Find a particular solution (yₚ) of the following equation using the method of undetermined coefficients.

a) (yₚ = Aeᵇˣ + C)
b) (yₚ = Ax² + Bx + C)
c) (yₚ = Aeᵇˣ)
d) (yₚ = Ax² + Bx)