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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- October 13th 2008, 04:53 AMshailen.sobheeTI89Ti: 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?

- November 7th 2008, 05:56 PMST47
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 - November 7th 2008, 10:14 PMshailen.sobhee
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.