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  • Perplex
    IB Math AAHL
    /
    Polynomials
    /

    Polynomial roots

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    Exercises

    Key Skills

    Polynomial roots

    Sum and product of polynomial roots and the conjugate root theorem.

    Want a deeper conceptual understanding? Try our interactive lesson!

    Exercises

    No exercises available for this concept.

    Practice exam-style polynomial roots problems

    Key Skills

    Degree n polynomial has n roots
    AHL 2.12

    A polynomial with degree ​n​ has ​n​ roots. These roots are not necessarily distinct, and not always real.

    Sum and product of roots
    AHL 2.12

    For a polynomial's roots:

    ​
    the sum is anβ€‹βˆ’anβˆ’1β€‹β€‹πŸ“–\\Β \\the product is an​(βˆ’1)na0β€‹β€‹πŸ“–
    ​
    Conjugate root theorem
    AHL 2.12

    For a polynomial with real coefficients, if a complex number ​z​ is a root, then the conjugate ​z⋆​ must also be a root.