Express f(x)=4x^3+6x^2+7x+2 in term of Legendre Polynomials.

melodykap

melodykap

Answered question

2021-09-11

Express f(x)=4x3+6x2+7x+2 in term of Legendre Polynomials.

Answer & Explanation

Malena

Malena

Skilled2021-09-12Added 83 answers

The Legendre equation is,
(1x2)d2y dx 22x dy  dx +n(n+1)y=0
The polynomial denoted by Pn(x) is called the Legendre polynomial of degree n
The first few polynomials are as follows.
P0(x)=1
P1(x)=x
P2(x)=3x2212
P3(x)=5x323x2
P4(x)=35x4830x28+38
P5(x)=63x5870x38+15x8
The typical form of a Legendre polynomial of order n is given by the sum,
Pn(x)=m=0M(1)m(2n2m)!2nm!(nm)!(n2m)!xn2m
where M={n2,for even degree equation n12,for odd degree equation }
We have,
f(x)=4x3+6x2+7x+2
Since the given polynomial is of cubic degree.
So,
f(x)=aP0(x)+bP1(x)+cP2(x)+dP3(x)
where the Legendre polynomials are
P0(x)=1, P1(x)=x, P2(x)=3x2212, P3(x)=5x323x2
On comparing,
 

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