# Inverse of a Symmetric Matrix

#### OhMyMarkov

##### Member
Hello everyone!

I'm struggling to find a general formula for obtaining an inverse of a symmetric matrix, for e.g.

1 i -1
i -i 2
-1 2 1

Any help is appreciated!

#### Sudharaka

##### Well-known member
MHB Math Helper
Hello everyone!

I'm struggling to find a general formula for obtaining an inverse of a symmetric matrix, for e.g.

1 i -1
i -i 2
-1 2 1

Any help is appreciated!
Hi OhMyMarkov,

Are you specifically concerned about 3x3 symmetric matrices? The general form of the inverse of a 3x3 matrix is given >>here<<. For a symmetric matrix $$b=d,\,c=g\mbox{ and } f=h$$.

Kind Regards,
Sudharaka.

#### OhMyMarkov

##### Member
Hello Sudharaka!

Well, I'm actually interested in symmetric matrices that have this shape (the given example is for a 3x3 matrix):

1 1 1
1 2 4
1 4 16

Note that the coefficients need not be real.