Question

factorise 1 - x square minus y square - 2 x y​

Answer 1

Answer:

Step-by-step explanation:

' 1 - x^2 - 2 x y - y^2 '

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

= 1 - ( x + y )^2

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

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

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