Question

Solve using identities (X + 1 + y) (x - 1 - y)

Answer 1

Answer:

((x) +(1+y))((x) -(1+y))

$(x {}^{2} ) {}^{2} - (1 + y {}^{2} ) {}^{2}$

$x {}^{4} - 1 - y {}^{4} + 2y {}^{2}$

$x {}^{4} - y {}^{4} - 2y {}^{2} - 1$