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Maka, dari rumus didapat :
9x² - (2y-3)² = {9x + (2y - 3)}{9x - (2y - 3)}
= (9x + 2y - 3)(9x - 2y + 3)
Jadi, faktor dari 9x² - (2y-3)² adalah 9x + 2y - 3, atau 9x - 2y + 3