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mukushla

  • 3 years ago

let\[f(x)=x^4+2x^3-4x^2-x+1\]the equation \(f(x)\) has 4 distinct real roots ; call them \(a,b,c,d\) suppose that \(g(x)\) is a degree 6 polynomial with roots \(ab,ac,ad,bc,bd,cd\). find the value of \(g(1)\). answer : \(g(1)=-9\)

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  1. mukushla
    • 3 years ago
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    i solved it with a painful method ... actually i've evaluated all of coefficients of g(x). but i lookin for a better method.

  2. mukushla
    • 3 years ago
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    @eliassaab @experimentX @satellite73

  3. eliassaab
    • 3 years ago
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    You can find a, b ,c, d using a symbolic manipulator and you get \[ \begin{array}{c} a=-3.14012 \\ b=-0.571167 \\ c=0.437829 \\ d=1.27346 \end{array}\\ g(x)=x^6+4 x^5-3 x^4-13 x^3-3x^2+4 x+1\\ g(1)=-9 \] This is probably the same way you did it. I will think about another method.

  4. experimentX
    • 3 years ago
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