HP 17bii+ solver equation question « Next Oldest | Next Newest »

 ▼ Don Shepherd Unregistered Posts: 1,392 Threads: 142 Joined: Jun 2007 02-17-2007, 09:44 PM Well, with all the talk about the 17bii+, I went out and bought one today. By the way, Les, it was \$80 with my Office Depot Star Teacher discount! Anyhow, why can't the Change Sign (+/-) key be included in an equation? ▼ John Smitherman Unregistered Posts: 177 Threads: 12 Joined: Jan 1970 02-17-2007, 10:34 PM Don / Les, what are your impressions of the keys on your new 17bii+'s? What are their serial numbers? Regards, John ▼ Don Shepherd Unregistered Posts: 1,392 Threads: 142 Joined: Jun 2007 02-17-2007, 10:48 PM John, the keys seem fine, no skips or hard-to-press. Serial # CNA62900787. ▼ Bruce Bergman Unregistered Posts: 553 Threads: 57 Joined: Sep 2006 02-18-2007, 01:22 AM Same here. I was a little concerned, what with the discussion, but so far the keys feel fine and haven't missed or doubled. The display is crystal clear -- very impressive. I'm digging into the HP Solver on this thing which is -- quite happily to my surprise -- much more powerful than I thought. I'm going to have some fun with this one. :-) thanks, bruce Oh, my S/N is CNA 63401403 Edited: 18 Feb 2007, 1:22 a.m. bill platt Unregistered Posts: 2,448 Threads: 90 Joined: Jul 2005 02-18-2007, 12:02 AM There is no use for the "change sign" command in an equation. You aren't "changing" anything when you are writing an equation. Rather, you are laying down a string of characters that are interpreted based on context. Therefore the minus sign and the plus sign are all you need--just as is the case when writing with a pencil. For example: 2-3^2 is evaluated as 2 minus (3^2) 2--3^2 is evaluated as 2 plus (3^2) 2---3^2 is evaluated as 2 minus (3^2) and 2+(-3^2) is also evaluated as 2 minus (3^2) If you want to do: (-3)^2 You have to do just that! If you need to change anything, you have the cursor positioning aroows, and the <- delete key. I hope that helps! ▼ Don Shepherd Unregistered Posts: 1,392 Threads: 142 Joined: Jun 2007 02-18-2007, 12:10 AM Yeah, thanks Bill. I'm making the transition between keystroke programming and equation "programming," and I'm learning the subtle differences between the two.

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