Transformation of Polynomials

A polynomial p(x)  can be Shifteded or stretched in the x-direction and the y-direction.

p (x) = a 9·x9 + a 8·x8 + ... + a 0 .

The coefficients of the polynomial can be entered as fractions, as mixed numbers or as breaking decimal numbers.

ƒ(x) = - 1/4·x4 + 2·x3 - 16·x + 21

Shifted by dx = -2, dy = 0                                       

ƒ(x + 2) = - 1/4 ·x4 + 6 ·x2 + 1

In the example, the function ƒ(x) has the axis of symmetry a:·x = -2. By Shifteding 2 steps to the left we get the function ƒ(x + 2), which is symmetrical to the y-axis and therefore only has summands with even powers of x.

Data exchange via the Windows clipboard

All program parts in which the coefficients of a polynomial are entered have a context menu (right mouse button) with which you can copy the entries from one program part to the clipboard and paste them from there into another program part.

The coefficients of the transformed function are automatically copied to the clipboard.

In this way, the functions ƒ(x)  and ƒ(x + 2)  were copied by copy and paste to the program part function plotter . The paste function automatically converts the table of coefficients into the function term.

Further examples:

ƒ(x) = x5 + 10·x4 + 36·x3 + 56·x2 + 33·x + 3

Shifted by dx = 2,   dy = 1

ƒ(x -2) + 1 = x5 - 4·x3 + x + 2
ƒ(x) = 1/4·x4 + 2·x2 - 1                               

Stretched by sx = 2, sy = 1

ƒ(1/2·x) = 1/64·x4 + 1/2·x2 - 1
ƒ(x) = 1/4·x4 + 2·x2 - 1                                 
 
Stretched by sx = 1/2, sy = 3

3·ƒ(2·x) = 12·x4 + 24·x2 - 3
ƒ(x) = x5 - 9·x4 - 82/9·x3 + 82·x2

Stretched by sx = -1, sy = 9

9·ƒ(-1x) = - 9·x5 - 81·x4 + 246·x3 + 738·x2 

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