Finding coefficients of a polynomial from roots

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Ahsan Zamee
Ahsan Zamee 2015-2-18
回答： Roger Stafford 2015-2-18
I have roots of a third order system. Now i need a function to get co-efficients of the polynomial for those roots. Thanks in advance

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Roger Stafford
Roger Stafford 2015-2-18
If r1, r2, and r3 are the roots, then a polynomial with those roots is:
p(x) = (x-r1)*(x-r2)*(x-r3) = x^3-(r1+r2+r3)*x^2+(r2*r3+r3*r1+r1*r2)*x-r1*r2*r3

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