Question about Texas Instruments TI-83 Plus Calculator
On the TI 83 plus the solver function was working fine up until recently. Now I put in the problems and get the error "No sign change" and underneath the answer and boundaries it now says "left-rt=(a different number each time I put in a new equation). I tried resetting my calculator and it didn't fix it.
Clearing the memory usually fixes this problem for me. If you hit 2nd and then + it will take you to the memory menu, where you can clear it by hitting 7. I usually hit clear all memory and confirm, and that fixes the problem for an equation or two, three if I'm lucky. For some reason using the solver too much makes it increasingly inaccurate to the point where you can't get an answer at all, but I don't know why.
Posted on Feb 05, 2013
Try a simple equation like x^2-1 which should come out with x = 1,-1
no sign change would indicate that the graph of the curve never crosses the x axis, if you graphed the above equation and calculated the zeros, it would come out with -1, 1 which it should, but if you put in x^2+1, the graph would never cross and therefore have no sign change from pos to neg or vice versa, the left-rt are the left and right bounds or the lower and upper bounds which was corrected in later calculators, Please let me know the outcome of graphing both of the above equations and then putting them in the solver. you could also use the quadratic equation to prove the answers if you liked, hope this helps
Posted on Mar 23, 2008
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