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QUESTION
How do you FOIL where three factors are used ##(x-1)(x+2)(x-3)##?
Start by foiling the first two factors then do the third.
##(X-1)(X+2) = X^2 - X+2X-2## or ##X^2 + X -2##
then do the third part
##(X^2 + X -2)(X-3) = X^3+X^2 - 2X - 3X^2 - 3X + 6##
or
##X^3 -2X^2 - 5X + 6##
