Finding roots and factors of the function


Assignment:

The equation x4 – 18x3 + 121x2 – 368x + 420=0

has complex conjugate roots (4+j2) & (4-j2). By a process of division and solving a quadratic equation, find all the roots and hence write down all the factors of :
                                                      
x4 – 18x3 + 121x2 – 368x + 420

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Algebra: Finding roots and factors of the function
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