Answer:
(x + y)(x - y - 1)
Explanation:
x² - y² - x - y =
= (x - y)(x + y) - (x + y)
= (x + y)(x - y - 1)
use a² - b² = (a - b)(a + b)
(x+y)(x-y-1)
x²-y²-x-y= (x+y)(x-y)-(x+y)= (x+y)(x-y-1)
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