POLYEVAL

Polynomial evaluation. Evaluates a polynomial with the

 

specified coefficients for the value of x.

 

 

POLYEVAL([coefficients], value)

 

 

Example

 

 

For x4+2x3–25x2–26x+120:

 

 

POLYEVAL([1,2,-25,-26,120],8) returns

 

3432.

 

POLYFORM

Polynomial form. Creates a polynomial in variable1 from

 

expression.

 

 

POLYFORM(expression, variable1)

 

 

Example

 

 

POLYFORM((X+1)^2+1,X) returns X^2+2*X+2.

POLYROOT

Polynomial roots. Returns the roots for the nth-order

 

polynomial with the specified n+1 coefficients.

 

 

POLYROOT([coefficients])

 

 

Example

 

 

For x4+2x3–25x2–26x+120:

 

 

POLYROOT([1,2,-25,-26,120]) returns

 

[2,-3,4,-5].

 

H I N T

 

The results of POLYROOT will often not be easily seen in

 

HOME due to the number of decimal places, especially if

 

they are complex numbers. It is better to store the results

 

of POLYROOT to a matrix.

 

 

For example, POLYROOT([1,0,0,-8]

M1 will

 

store the three complex cube roots of 8 to matrix M1 as

 

a complex vector. Then you can see them easily by going

 

to the Matrix Catalog. and access them individually in

 

calculations by referring to M1(1), M1(2) etc.

 

Using mathematical functions

11-11