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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##

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