Como se suprime los signos de agrupacion y reduce los termino semejantes de 4y a la 2 +[x a la 2 -xy-(-3 a la 2+x a la 2)]
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4y² + [x² - xy - (- 3² + x²)]
4y² + [x² - xy - ( - 9 + x²)]
4y² + [x² - xy + 9 - x²]
4y² + [x² - x² - xy + 9]
4y² + [- xy + 9]
4y² - xy + 9