Here we describe and illustrate an alternative to the method of undetermined coe-
cients for obtaining a particular solution of a linear dierential equation with constant
coecients. The method requires only polynomial dierentiation and some elementary
algebra. The procedure has also been expressed as a recursive algorithm. Examples
have been included to show the usefulness of the recursive analogue. Both the technique
and its recursive equivalent can be suitably reformulated for similar dierence
equations