Question

como se desarrolla (×+y+1)(×-y-1)
Ayúdenme porfavor ​

Answer 1

(x+y+1)(x−y−1)

=(x+y+1)(x+−y+−1)

=(x)(x)+(x)(−y)+(x)(−1)+(y)(x)+(y)(−y)+(y)(−1)+(1)(x)+(1)(−y)+(1)(−1)

=x^2−xy−x+xy−y^2−y+x−y−1

=x^2−y^2−2y−1