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Verified answer
Hasil dari= 9(x - y)² - 25(x - 2y)²
= 9(x² - 2xy + y²) - 25(x² - 4xy + 4y²)
= 9x² - 18xy + y² - 25x² + 100xy - 100y²
= 9x² - 25x² - 18xy + 100xy + y² - 100y²
= -16x² + 82xy - 99y²
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