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8p² + 10p + 15 dari 4p² - 10p - 5 = (4p² - 10p - 5) - (8p² + 10p + 15)
= 4p² - 10p - 5 - 8p² - 10p - 15
= -4p² - 20p - 20 (C)
= 4p²-10p-5-8p²-10p-15
= -4²-20p-20 (c)