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4a² - 6ab - 6ab + 9b²
4a² -12ab + 9b²
2a x 2a = 4a kuadrat
2a x -3b = -6ab
-3b x 2a = -6ab
-3b x -3b = 9b kuadrat
4a kuadrat + (-6ab) + (-6ab) + 9b kuadrat = 4a kuadrat + -12ab + 9b kuadrat
maaf banget kalo salah