Posts: 177
Threads: 12
Joined: Jan 1970
Don / Les, what are your impressions of the keys on your new 17bii+'s? What are their serial numbers?
Regards,
John
Posts: 2,448
Threads: 90
Joined: Jul 2005
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!