HP 39gs Master Manual page 181

If you would like a solution such as
the line to remove all but the decimal root and square it to find the original discriminant.
If you are fortunate enough to have an hp 40gs rather than an hp 39gs then you can do all this far more
easily in the CAS. See page 309 for details on finding roots of real and complex polynomials using the CAS
on the hp 40gs.
See also: FNROOT, LINEAR?
QUOTE(<var_name>)
Again, this is a function intended for use mainly by programmers. Programmers sometimes want to store a
function such as into one of
X - 4
2
won't be entered symbolically. Instead, the contents of memory
then the expression is evaluated to give a numeric result. The
QUOTE(X) - 4 F1(X)
2
An easier method of storing a function into an aplet in a program is to enclose it in single quotes. For
example
'(X) - 4' F1(X)
2
entering will not work but
F1('X')
page 262 in the chapter "Programming on the hp 39gs & hp 40gs" for an example of use in writing code.
The | function written as: <expression> | (var1=value,var2=value,...)
This is called the 'where' function. The reason for this is that it is used to evaluate formulas, of the type when
one would say "Evaluate ....., where a = 5, b = 4 etc". The formula must be in the form of an expression
rather than an equation. You should enter the expression first, then the 'where' symbol and then the values of
all the variables in the expression. Any not supplied will be evaluated using the value currently stored in that
memory. This is again a function which is of more use to programmers since this is definitely handled far more
flexibly in the Solve aplet.
b c
Eg. 1 Evaluate
a =
Use:
(B+C)/D|(B=6,C=-2,D=8)
Answer:0.5
Eg. 2 Using the formula d =
object would fall under Earth's gravity of 9.8 m/s
Use:
.5AT2|(A=9.8,T=6)
Answer:176.4 meters
See also: ISOLATE
3 +
5
rather than 2.6180 then you would have to
2
...
F1(X) F9(X)
will ensure a symbolic result.
woul d serve the same purpose as
F1(QUOTE(X))
+
where b = 6, c = -2 and d = 8
d
1
, find the distance d which an
2
at
2
using . It turns out that if you use
(a number) is substituted and entered and
X
function fixes this. For example,
QUOTE
QUOTE(X)
2
will. No-one ever promised consistency! See Example 1 on
2 in a time of 6 seconds.
181
the result, edit
COPY
F1(X - 4
2
On the other hand,
- 4 F1(X).
) then it