## Intermediate Algebra for College Students (7th Edition)

$(x+my)(x+ny)=x^{2}+(m+n)xy+(mn)y^{2}$ $x^{2}+xy+y^{2}=$ Searching for two factors of $c=+1$ whose sum is $b=+1,$ we find$\qquad$that there aren't any. The trinomial is prime.