HP HP-28S - One-Number Functions

Make the exponent negative.
[CHS[
Put the number on the stack.
[ENTER I
2: 19
1: .666666666667
-4.2E-120
IiEtIHBII"I!:HGEJII1I'lmIIII
3: 19
2: .666666666667
1: -4.2E-12
IiEtIHBII"I!:HGEJII1I'lmIIII
Don't forget to use [ CHS I to key in negative numbers. For example, if
this
manual shows the keystrokes - 4 0, you'll need to press [I)
[cHsI0·
One-Number Functions
Functions that act on a single number-for example, negating a num-
ber or taking a square root-are called one-number functions. All act
on the number in level 1. There are four one-number functions on the
keyboard:
• Press [
CHS I to negate the number.
• Press .OEJ to take the inverse (reciprocal) of the number.
• Press .em to take the square root of the number.
• Press .0 to square the number.
If you're keying in a number, it's not necessary to press I ENTER I before
executing the one-number function-pressing the function key auto-
matically performs ENTER for you. For example, you can calculate 1/8
as follows:
8.OEJ
3: .666666666667
2: -4.2E-12
1: .125
IiEtIHBII"I!:HGEJII1I'lmIIII
40 2: Doing Arithmetic