Scientific notation (powers of 10), Explicit and implicit multiplication, Example – HP 39g Graphing Calculator User Manual
Page 31
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Scientific
notation
(powers of 10)
Example
4
-7
A number like 5x10 or 3.21 x 10 is written in scientific
notation, that is, in terms of powers of ten. This is simpler to
work with than 50000 or 0.000000321. To enter numbers like
these, use
eex
. (This is easier than using fxjlOfx^.)
Calculate
3x 10
(T| 4
|SHIFT|££X
013 [)]
0
II
]6
[
shift
|£EX
23CO E] 3
|SHIFT|££X
05
4.E-13*6.E23X.00003
8.E15
Explicit and
implicit
multiplication
H I N T
Implied multiplication takes place when two operands appear
with no operator in between. If you enter
AB,
for example, the
result is
A*B.
However, for clarity, it is better to include the multiplication
sign where you expect multiplication in an expression. It is
clearest to enter
AB
as
A*B.
Implied multiplication will not always work as expected. For
example, entering
A
{
B+4
) will not give
A*
(
B+4
). Instead
an error message is displayed: “Invalid User Function”. This
is because the calculator interprets
A
(
B+4
) as meaning
‘evaluate function
A
at the value
B+4’,
and function
A
does
not exist. When in doubt, insert the * sign manually.
Getting started
1-19