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= 3a² + 2b² - 7a² - 3b² - 1
= -4a² - b² - 1
b) 2a² + 4b² - c² dari 3a² - 2b² + 3c²
= 3a² - 2b² + 3c² - 2a² + 4b² - c²
= a² + 2b² + 2c²