Texas Instruments TI-30XIIB Owners Manual - Page 40

tilt:], Ektil

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This example could have been performed_ simply by t i linking each expression together with a and not using the memory. But if each of the three expressions had been tar more complicated, then solving the entire problem sequentially could be risky. An uncorrectable mistake during calculations would mean starting over from the first. Summing to memory saves each completed expression making the calculation of each new series of terms independent of the previous ones. Memory Exchange The Exchange key swaps the content of the memory with the display value. The display value is stored and the previously stored value is displayed. This key combines the store and recall operations into a single key. Use of this key. like the other memory keys. does not disturb a sequence of calculations and can consequently be used anywhere in the solution of a problem. The ]tilt:] key permits you to solve problem 1 and store the result Then solve problem 2 and compare the results of the two problems while retaining both answers. Also, numbers can be temporarily stored and used as needed. Example* Evaluate A' + 2A8 + B' = for A = .258963 and I:5- 1.25632 Enter Press Display Comments .253963 ;091 i xi] [=3 .06706184 Store A. A' displayed 1.25632 (yj 1 25632 Enter B :txcl 0.258963 Store B. recall A [X] 0.3253404 A x B displayed 2 Ektil .71774263 A' + 2AB displayed 1.25632 Recall B 1 5783399 B' 2.2960826 Answer When A is recalled from memory for the last time it is needed. B is instantly stored in its place by the single keystroke kit] 38

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This
example
could
have
been
performed_
simply
by
linking
each
expression
together
with
a
t i
and
not
using
the
memory.
But
if
each
of
the
three
expressions
had
been
tar
more
complicated,
then
solving
the
entire
problem
sequentially
could
be
risky.
An
uncorrectable
mistake
during
calculations
would
mean
starting
over
from
the
first.
Summing
to
memory
saves
each
completed
expression
making
the
calculation
of
each
new
series
of
terms
independent
of
the
previous
ones.
Memory
Exchange
The
Exchange
key
swaps
the
content
of
the
memory
with
the
display
value.
The
display
value
is
stored
and
the
previously
stored
value
is
displayed.
This
key
combines
the
store
and
recall
operations
into
a
single
key.
Use
of
this
key.
like
the
other
memory
keys.
does
not
disturb
a
sequence
of
calculations
and
can
consequently
be
used
anywhere
in
the
solution
of
a
problem.
The
]tilt:]
key
permits
you
to
solve
problem
1
and
store
the
result
Then
solve
problem
2
and
compare
the
results
of
the
two
problems
while
retaining
both
answers.
Also,
numbers
can
be
temporarily
stored
and
used
as
needed.
Example*
Evaluate
A'
+
2A8
+
B'
=
for
A
=
.258963
and
I:5-
1.25632
Enter
Press
Display
Comments
.253963
;091
i
xi]
[=3
.06706184
Store
A.
A'
displayed
1.25632
(yj
1
25632
Enter
B
:txcl
0.258963
Store
B.
recall
A
[X]
0.3253404
A
x
B
displayed
2
.71774263
A'
+
2AB
displayed
Ektil
1.25632
Recall
B
1
5783399
B'
2.2960826
Answer
When
A
is
recalled
from
memory
for
the
last
time
it
is
needed.
B
is
instantly
stored
in
its
place
by
the
single
keystroke
kit]
38