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单词 Viète’s formulae
释义
Viète’s formulae

Mathematics
  • Say that a cubic z3 + az2 + bz + c has roots α‎, β‎, γ‎ so that

    z3+az2+bz+c=(zα)(zβ)(zγ),

    then, by expanding the RHS and comparing coefficients,

    α+β+γ=a,αβ+βγ+γα=b,αβγ=c.

    These are Viète’s formulae and naturally generalize to higher degree polynomials.


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