Question

Factorise :y^2 - 1- 2x - x^2
Plzz give me the answer.

Answer 1

$<h2>y² - x² - 2x - 1</h2>$
= y² - ( x² + 2x + 1 )


= y² - ( x - 1 )²


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