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Squareroot (not roots) of a polynomial?

Squareroot (not roots) of a polynomial?

Squareroot (not roots) of a polynomial?

(OP)
Hello,

I´ve got a question about polynomials. To implement my algorithm I need several operations with polynomials. So I use the vectorial representation to perform multiplications and so on ...
But one element has to have the form sqrt(x^2-1). But I can´t define it as sqrt([1 0 -1]). It´s not the same. I haven´t found an operator like "conv" for rooting a polynomial.
Has someone an idea how to solve my problem?

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