Examples
1. Find Missing terms in interpolation table

x	f(x)
2	45
3	49.2
4	54.1
5	?
6	67.4

Solution:
The value of table for `x` and `y`

x	2	3	4	5	6
y	45	49.2	54.1	?	67.4

Here we are given 4 values of y. We assume that y is polynomial of degree 3.
Hence `Delta^4 y_0=0`

`(E-1)^4 y_0=0`

`(E^4-4E^3+6E^2-4E+1) y_0=0`

`y_4-4y_3+6y_2-4y_1+y_0=0`

`:.67.4-4(a)+6(54.1)-4(49.2)+45=0`

`:.-4a+240.2=0`

`:.-4a=-240.2`

`:.a=(-240.2)/(-4)`

`:.a=60.05`

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