OT: can somebody help me with this series/sum Calculus II type problem?

[Rus]

Following your example I put in sum(seq(1/(x^2), x, 1, 15, 1) and got 1.580440283 I've never come across a TI calc that went loopy like that. Maybe reset it and update the OS? Mine has been with me for about 6 years and has given me no problems.

P.S.: Note that I enclosed the x^2 in parenthesis. I've found that oftentimes that is necessary to do.

[ryan roopnarine]

Following your example I put in sum(seq(1/(x^2), x, 1, 15, 1) and got 1.580440283 I've never come across a TI calc that went loopy like that. Maybe reset it and update the OS? Mine has been with me for about 6 years and has given me no problems.

no, leave the parenthesis off the back of (x^2, and no parenthesis to close the expression, and it works for some reason. i had the same ti83 between 1998 and 2006, and it began to go flaky in the beginniing of 2005. it would take 5 minutes to graph simple things like x^2, and the "processing" bars at the top right of the screen would constantly chug. finally, one day, it said "system ram failure" and never started up again. i know of at least 2 other people that have dying units. i don't know what to do about this thing...i just changed majors, but i might still need to follow along to ti-83/84 instructions or such. hell of a racket they have, really.

[Rus]

no, leave the parenthesis off the back of (x^2, and no parenthesis to close the expression, and it works for some reason. i had the same ti83 between 1998 and 2006, and it began to go flaky in the beginniing of 2005. it would take 5 minutes to graph simple things like x^2, and the "processing" bars at the top right of the screen would constantly chug. finally, one day, it said "system ram failure" and never started up again. i know of at least 2 other people that have dying units. i don't know what to do about this thing...i just changed majors, but i might still need to follow along to ti-83/84 instructions or such. hell of a racket they have, really.

Hmm, mine works your way too. Those TI-89 calcs look mighty tasty for a replacement Like I said, you can try resetting all memory and updating the software using another calculator. Maybe it'll help?

[jgardia]

you don't need the parenthesis, because 1/x^2 == 1/(x^2) == (1/x)^2

Following your example I put in sum(seq(1/(x^2), x, 1, 15, 1) and got 1.580440283 I've never come across a TI calc that went loopy like that. Maybe reset it and update the OS? Mine has been with me for about 6 years and has given me no problems.

P.S.: Note that I enclosed the x^2 in parenthesis. I've found that oftentimes that is necessary to do.