Finding Symmetric and Skew-Symmetric Matrixes B and C for A=B+C

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SUMMARY

The discussion focuses on finding symmetric matrix B and skew-symmetric matrix C such that A = B + C, where A is defined as A = [[3, 6], [-2, 1]]. A symmetric matrix B satisfies the condition B = transpose(B), while a skew-symmetric matrix C satisfies C = -transpose(C). The solution involves using the properties of matrix transposition and the relationships between symmetric and skew-symmetric matrices to derive B and C from A.

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Homework Statement




A matrix B is symmetric if B=transpose B.

A matrix C is skew-symmetric if C=−transpose C.

Let A be the matrix given by

A=[[3,6],[-2,1]]

Determine any symmetric matrix B and any skew-symmetric C such that A=B+C

Homework Equations



All given above. Don't know if I need any more.

3. My attempt and issue

I think two equations can be made A =B+C and A = BT - CT
Don't know how to solve them
 
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It's been awhile since I've done matrices, but I'll give it a shot. I believe your two equations are correct, you just need to solve for B and C.

Here is what I would do: Solve for either B or C in the first equation ( [itex]A = B + C[/itex] ), plug it into the second equation and use this property: [itex](A+B)^{T}=A^{T}+B^{T}[/itex]. See if that gets you anywhere!
 
A+A^T is symmetric, and A-A^T is antisymmetic, yes? Tell me why? Can you think of some way to combine them to get A?
 

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