Elementary Symmetric Polynomials Used To Factor A Six Term Expression, x^2 + y^2 + 2xy + 4x +4y - 21

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x^2 + y^2 + 2xy + 4x +4y - 21 has no greatest common factor(GCF). Factoring by Grouping is difficult in this case. The substitution sigmasub1 = x+y leads to an easy factorization.
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