# The Epsx0 Function And The Cas Variable Eps; The Peval Function - HP 49g+ User Manual

Graphing calculator.

The QUOT and REMAINDER functions
The functions QUOT and REMAINDER provide, respectively, the quotient Q(X)
and the remainder R(X), resulting from dividing two polynomials, P
P
(X). In other words, they provide the values of Q(X) and R(X) from
2
P
(X)/P
(X) = Q(X) + R(X)/P
1
2
QUOT(X^3-2*X+2, X-1) = X^2+X-1
REMAINDER(X^3-2*X+2, X-1) = 1.
Thus, we can write: (X
Note: you could get the latter result by using PROPFRAC:
PROPFRAC('(X^3-2*X+2)/(X-1)') = 'X^2+X-1 + 1/(X-1)'.

## The EPSX0 function and the CAS variable EPS

The variable ε (epsilon) is typically used in mathematical textbooks to
represent a very small number. The calculator's CAS creates a variable EPS,
with default value 0.0000000001 = 10
You can change this value, once created, if you prefer a different value for
EPS. The function EPSX0, when applied to a polynomial, will replace all
coefficients whose absolute value is less than EPS with a zero.
EPSX0 is not available in the ARITHMETIC menu, it must be accessed from the
function catalog (N). Example:
EPSX0('X^3-1.2E-12*X^2+1.2E-6*X+6.2E-11)=
With µ:

### The PEVAL function

The functions PEVAL (Polynomial EVALuation) can be used to evaluate a
polynomial p(x) = a
⋅x
n
n
, a
, ... a
coefficients [a
n
n-1
evaluation p(x
). Function PEVAL is not available in the ARITHMETIC menu, it
0
must be accessed from the function catalog (‚N). Example:
(X). For example,
2
3
2
-2X+2)/(X-1) = X
+X-1 + 1/(X-1).
-10
, when you use the EPSX0 function.
'X^3-0*X^2+.0000012*X+0'.
'X^3+.0000012*X'.
+a
⋅x
n-1
+ ...+ a
⋅x
2
+a
n-1
2
1
, a
, a
] and a value of x
2
1
0
PEVAL([1,5,6,1],5) = 281.
(X) and
1
Function
⋅x+ a
, given an array of
0
. The result is the
0
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