Just ask your calculator
04-12-2017, 01:20 PM
Post: #1
 pier4r Senior Member Posts: 2,248 Joined: Nov 2014
Just ask your calculator

Found on a book preparing for nationwide tests after high school.

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04-12-2017, 05:13 PM
Post: #2
 KeithB Senior Member Posts: 527 Joined: Jan 2017
RE: Just ask your calculator
Is that CAS or Home mode?

Home gives an error.

CAS gives infinity on the Prime.

For my HP71 it depends on the flag settings. If you work hard you can get NaN.
04-12-2017, 07:35 PM
Post: #3
 pier4r Senior Member Posts: 2,248 Joined: Nov 2014
RE: Just ask your calculator
The quote was from a McGraw Hill publication. Not related to any calculator manual.

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04-12-2017, 07:43 PM
Post: #4
 KeithB Senior Member Posts: 527 Joined: Jan 2017
RE: Just ask your calculator
Sorry, forgot the 8^)
04-14-2017, 01:20 AM
Post: #5
 Joe Horn Senior Member Posts: 2,009 Joined: Dec 2013
RE: Just ask your calculator
(04-12-2017 05:13 PM)KeithB Wrote:  For my HP71 it depends on the flag settings. If you work hard you can get NaN.

On an HP-71B, after TRAP(IVL,2), 0/0 yields NaN, but 4/0 yields Inf. How do you get 4/0 to yield NaN?

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-Joe-
04-17-2017, 03:56 PM
Post: #6
 KeithB Senior Member Posts: 527 Joined: Jan 2017
RE: Just ask your calculator
Have a bad memory? I thought every /0 yielded NaN.
04-18-2017, 08:06 AM
Post: #7
 grsbanks Senior Member Posts: 1,219 Joined: Jan 2017
RE: Just ask your calculator
Nope. Only 0/0 is undetermined mathematically.

x/0 for real value x!=0 is always +INF or -INF depending on the sign of x.
04-18-2017, 11:42 AM
Post: #8
 SlideRule Senior Member Posts: 1,495 Joined: Dec 2013
RE: Just ask your calculator
(04-18-2017 08:06 AM)grsbanks Wrote:  Only 0/0 is undetermined mathematically. x/0 for real value x!=0 is always +INF or -INF depending on the sign of x.

Could you cite your source, such as at Math-only-Math under Properties of Division, Property 4 is the following Note: In order to divide 6 by 0, we must find a whole number which when multiplied by 0 gives us 6. Clearly, no such number can be obtained. We, therefore, say that division by 0 is not defined.

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SlideRule
04-18-2017, 01:10 PM (This post was last modified: 04-18-2017 01:11 PM by pier4r.)
Post: #9
 pier4r Senior Member Posts: 2,248 Joined: Nov 2014
RE: Just ask your calculator
(04-18-2017 08:06 AM)grsbanks Wrote:  Nope. Only 0/0 is undetermined mathematically.

x/0 for real value x!=0 is always +INF or -INF depending on the sign of x.

For the little that I know, this should be valid only with limits. I mean : the divisor (epsilon) approaching to zero in the formula x/epsilon

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