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25x2+60xy+36y2
b. 36x2-54xy-54xy+81y2
36x2-108xy+81y2
a). (5x+6y)² = 25x² + 2(30xy) + 36y² = 25x² + 60xy + 36y²
(6x-9y)² = 36x² + 2(-54xy) + 81y² = 36x² - 108xy + 81y²