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I'm wondering if there's some nice formula for the expansion of trinomials, like this:

[tex]\prod_i \left(y + x - a_i\right)[/tex]

or for this:

[tex]\prod_i \left(x^2 + a_ix - b_i\right)[/tex]

I know for instance that in the case of binomials there is the elementary symmetric polynomials available; thus I wonder if there's anything similar for trinomials. Thank you :)

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# Formula for multiplication of trinomials

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