Question

factorise x²-y²-2y-1​

Answer 1

Step-by-step explanation:

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

Question: x²-y²-2y-1

Step-by-step explanation:

So...

We will take -y²-2y-1 in brackets with minus as common

=x²-(y²+2y+1)

We will apply (a+b)² process

So....

=x²-(y²(2×y×1 + 1²)

=x²-(y-1)²

=(x+y+1)(x-y-1) is the answer

hope this helps you ☺️