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= 2{(3x)² - 2(3x)(6y) + (6y)²} + 5{(x)² - 2(x)(3y) + (3y)²}
= 2{9x² - 36xy + 36y²} + 5{x² - 6xy + 9y²}
= 18x² - 72xy + 72y² + 5x² - 30xy + 45y²
= (18 + 5)x² - (72 + 30)xy + (72 + 45)y²
= 23x² - 102xy + 117y²
6x-6x-10x-10x-12xy-12xy+15y+15y
30y