Question

Factorise x²-1-2y-y² ​

Answer 1

Answer is : (x+1+y)(x+1-y)

Answer 2

Answer:

(x^2-1) (1-y) (2-y)

Step-by-step explanation:

(x^2) - (2y-y^2)

1(x^2-1) -y (2-y)

(x^2) (1-y) (2-y)