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Thread: Finding the zeros for a polynomial function

  1. #1
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    Question Finding the zeros for a polynomial function

    Hi,

    I hope someone can help. I'm trying to determine the x-intercept for the following polynomial function: y = - (2x + 5)^4 - 20

    The answer is apparently -3.86, but I don't see how I would get to such solution. Could someone please provide the algebraic steps to get to this?

    Thanks,
    Olivia
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    Re: Finding the zeros for a polynomial function

    Quote Originally Posted by otownsend View Post
    Hi,

    I hope someone can help. I'm trying to determine the x-intercept for the following polynomial function: y = - (2x + 5)^4 - 20

    The answer is apparently -3.86, but I don't see how I would get to such solution. Could someone please provide the algebraic steps to get to this?
    $y = -(2x+5)^4 - 20$ does not have an x-intercept since $y < 0$ for all $x \in \mathbb{R}$

    did you post the function correctly?
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    Re: Finding the zeros for a polynomial function

    Yes, you're correct about me not typing out the function correctly. The function is actually to the degree of 3, as opposed to 4. I was able to solve it.
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