How to solve the pole of polynomial with matrix coefficient

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ohmatlab
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Hi! This is my first post here. If I make any mistake, please tell me.

I have a question: if I want to find a pole of a polynomial, ex: " a*s^2+b*s+c ", a,b,and c are constant given. I just use simple command: roots([a, b,c]), I can get the answer.
However, if now I meet a situation is " A*s^2+C=0 ", A and C are all 3*3 constant matrices, I used the " sym and solve " to find the equation. It's OK. However, except this method, is there any simple command, just like " roots " to solve the polynomial with matrix coefficient?

Thanks!
 
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