factorise x2-1-2y-y2
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=x2-(1+y)2
=(x+y+1)(x-y-1)
x² - 1 - 2y - y²
= x² - y² - 2y - 1
= x² - ( y² + 2y + 1 )
= x² - ( y + 1 )²
= [ x + ( y + 1 ) ] × [ x - ( y + 1 ) ]
= [ x + y + 1 ] × [ x - y - 1 ]
Hope it helps