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(x + y) (x - y) - (x + y)² ............ factor comun (x + y)
(x + y)[ (x - y) - (x + y) ] =
(x + y)( x - y - x - y) =
(x + y)(- 2y) =
-2xy - 2y² <== Respuesta
(x + y) (x - y) - (x + y)²
(x² - y²) - (x² + 2xy + y²)
x² - y² - x² - 2xy - y²
- 2xy
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*****
(x + y) (x - y) - (x + y)² ............ factor comun (x + y)
(x + y)[ (x - y) - (x + y) ] =
(x + y)( x - y - x - y) =
(x + y)(- 2y) =
-2xy - 2y² <== Respuesta
(x + y) (x - y) - (x + y)²
(x² - y²) - (x² + 2xy + y²)
x² - y² - x² - 2xy - y²
- 2xy