x square -1 -2y -y square
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given:-
x2-1-2y-y2
group them
(x2-1)-(2y-y2)
now (x2-1) is forming an identity :- a2-b2=(a+b)(a-b)
so
(x+1)(x-1)-y(2+y)
_________
given:-
x2-1-2y-y2
group them
(x2-1)-(2y-y2)
now (x2-1) is forming an identity :- a2-b2=(a+b)(a-b)
so
(x+1)(x-1)-y(2+y)
_________
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