X^3 - X^2 - 2X =0
factor out the X
X(X^2 - X - 2)
X(X + 2)(X-1)
fully factored
X = 0
X = -2
X = 1
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-3
There is no simple way of factorising AB - CD
Solve the equation - by whatever means available to you: factorising, graphical, numerical approximations, etc.
to simplifiy into terms which, when multiplied together, will create the original term.
To find the common factor when factorising, look for any common factors that can be divided evenly from all the terms in the expression. Divide each term by this common factor, and then factorise the resulting expression further if possible. This will help simplify the expression and make it easier to work with.