factorise:
x-y-x^2+y^2
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⇒ x - y - x² + y²
⇒ (x - y) - (x² - y²)
⇒ 1(x - y) - (x + y)(x - y)
⇒ (x - y)(1 - (x + y))
⇒ (x - y)(1 - x - y)
Thank you...
shadowsabers03:
Thank you for marking my answer as the brainliest.
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