Factorise : x³-4x²+5x-2
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sum of coffiecient = 1-4+5-2=0
therefore (x-1) is a factor
reminder = 0
f(x) x³-4x²+5x-2
= (x-1) (x²-3x+2)
= (x-1) (x-1 ) ( x - 2 )
= (x-1)² (x-2) ans
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