Question

Factorise using identity x-y-x2+y2

Answer 1

$x-y-x^2+y^2 \\ \\ x-y-(x^2-y^2) \\ \\ x-y-(x+y)(x-y) \\ \\ 1(x-y)-(x+y)(x-y) \\ \\ (1-(x+y))(x-y) \\ \\ (1-x-y)(x-y)$

Hope this may help you. ^_^  ^_^  ^_^

Answer 2

Hello,

Here is your answer

x - y - x² + y²

Taking Brackets

x - y - ( x² - y² )

Using a² - b² = ( a - b ) ( a + b )

x - y - ( x - y ) ( x + y )

Taking common

( x - y ) * (1 - (x + y) )

Open Brackets

( x - y ) ( 1 - x - y )