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Math Help - cut the y intercept

  1. #1
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    cut the y intercept

    where does the function cut the yintercept f(x) =
    x^3 -3x^2 -9x +2

    +2?

    or when I get the f '(x) 3x^2 -6x -9 -9?
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  2. #2
    MHF Contributor
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    Talking

    I've never heard that terminology. I will guess that "cut the y-intercept" means something like "cuts" (or crosses) "the y-axis". If this is correct, then you need to plug zero in for x to find the y-value of the y-intercept.

    I don't know what you're trying to do with the derivative, so I'm afraid I cannot comment on that. Sorry!
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  3. #3
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    Quote Originally Posted by stapel View Post
    I've never heard that terminology. I will guess that "cut the y-intercept" means something like "cuts" (or crosses) "the y-axis". If this is correct, then you need to plug zero in for x to find the y-value of the y-intercept.

    I don't know what you're trying to do with the derivative, so I'm afraid I cannot comment on that. Sorry!
    Hello
    Yes in Ireland we say 'cuts the y- intercept'or crosses
    do I plug 0 into the original cubic expression?
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  4. #4
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    Quote Originally Posted by wolfhound View Post
    Hello
    Yes in Ireland we say 'cuts the y- intercept'or crosses
    do I plug 0 into the original cubic expression?
    calculate f(0).
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  5. #5
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    Quote Originally Posted by wolfhound View Post
    where does the function cut the yintercept f(x) =
    x^3 -3x^2 -9x +2

    +2?

    or when I get the f '(x) 3x^2 -6x -9 -9?
    yes you are right. +2 is the answer.

    Here is a graph.
    Attached Thumbnails Attached Thumbnails cut the y intercept-.jpg  
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  6. #6
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    Quote Originally Posted by BabyMilo View Post
    yes you are right. +2 is the answer.

    Here is a graph.
    Thanks,nice graph
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