Question

One of the factor for x3-23x2+142x-120 is

Answer 1

Let p (x) =  x³ - 23 x² + 142 x - 120

 x = 1

     p (1) = 1³ - 23 (1)² + 142 (1) - 120

             = 1 - 23 + 142 - 120

             = 143 - 143

             = 0

Answer 2

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