Factorise: x cube-2x square-x+2
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X³–2X²–X+2 = 0
(X–1)(X²–X–2) = 0
(X–1)(X–2)(X+1) = 0
X = –1 or X = 1 or X = 2
(X–1)(X²–X–2) = 0
(X–1)(X–2)(X+1) = 0
X = –1 or X = 1 or X = 2
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