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Math Help - TI89Ti: List all zeros

  1. #1
    Junior Member
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    Mesnil, Mauritius
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    30

    Arrow TI89Ti: List all zeros

    Is there a TI89 app that can list all zeros in a plotted graph for the range xmin-xmax (in WINDOW menu), without having to find all the zeros manually, tediously specifying the lower bound and upper bound for each zero?
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  2. #2
    Newbie
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    Nov 2008
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    If it's anything like a TI-89Ti, then yeah. From the home screen, type this: (I'm assuming your function is in Y1)
    zeros(Y1(x),x)
    (zeros() is under F2:Algebra)

    If you want to use a restriction on the domain (VERY recommended for trig functions) use solve instead:
    solve(Y1(x)=0,x)|x>-10 and x<10
    solve is in the same place as zeroes, "and" is in 2nd math/8:test/8:and
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  3. #3
    Junior Member
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    Sep 2008
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    Mesnil, Mauritius
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    Thanks ST47,

    Thats helpful. But, is there any means for the TI89Ti to show the value of the zeros on the graph?

    I have searched for an application that can do this, but in vain. I believe if there are such apps, they actually modify the operating system/maths application that draws the graphs.

    Showing the zeros on the graph for the given domain stated in the menu Window would definitely be of great visual help.
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