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2 July, 03:58

Write a polynomial function of least degree with integral coefficients that has the given zeros.

0, - 5, 3 + i

need to show all work

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Answers (1)
  1. 2 July, 04:15
    0
    The zeroes are

    0, - 5, 3 + i (and its conjugate)

    The factors are

    x (x + 5) (x - (3 + i)) (x - (3 - i))

    Expanding ...

    (x² + 5x) ((x - 3) - i) ((x - 3) + i)

    (x² + 5x) ((x - 3) ² - i²)

    (x² + 5x) (x² - 6x + 9 - (-1))

    (x² + 5x) (x² - 6x + 10)

    x⁴ - 6x³ + 10x² + 5x³ - 30x² + 50x

    x⁴ - x³ - 20x² + 50x
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