algebra

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List all possible rational zeros for the polynomial below. Find all real zeros and factor completely. Please show all your work.
f(x) = 2x^4 + 19x^3 + 37x^2 - 55x - 75

  • algebra -

    Graph this first to find the zeros, hopefully exactly.

  • algebra -

    There is a process to this and it's why I am asking for help.

  • algebra -

    All rational roots will have a numerator which is a factor of 75, and a denominator which is a factor of 2.

    ±1 ±3 ±5 ±15 ±25 ±75
    ±1/2 ±3/2 ±5/2 ±15/2 ±25/2 ±75/2

    Descartes' Rule of Signs says that there are at most

    1 positive real root
    2x^4 + 19x^3 + 37x^2 - 55x - 75 has one change of sign

    2 negative real roots
    2x^4 - 19x^3 + 37x^2 + 55x - 75

    So, we either have a double root, or some complex roots.

    A little synthetic division reveals that there are no real roots greater than 2 or less than -6.

    A little more produces the root -1

    (x+1)(2x^3 + 17x^2 + 20x - 75)
    (x+1)(2x-3)(x+5)^2

  • algebra -

    I have done synthetic divion and come up with 3/2 and -1 but still have not gotten it down to a trinomial.

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