Question 985472
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4    |   1    -6    5    12
     |         4   -8   -12
     |________________________
         1    -2   -3    0


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First factorization is {{{(x-4)(x^2-2x-3)}}}.


The quadratic is easily factored:  {{{(x-3)(x+1)}}}.


{{{highlight(P(x)=(x-4)(x-3)(x+1))}}}