First slide
Theory of equations
Question

Let P(x)=x38x2+cxd and be a polynomial with real coefficients and with all its roots being distinct positive integers. Then number of possible value of c is ____.

Moderate
Solution

We have, x1+x2+x3=8
            x1x2x3=dx1x2+x2x3+x3x1=c
Possible roots 1,2,5 or 1,3,4
     d=10 or d=12     c=2+10+5=17  or  3+12+4=19
Hence, d=10 and c=17  or  d=12 and c=19

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