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(2a + 3b - 4y)(2a + 3b - 4y)
2a(2a) + 2a(3b) + 2a(- 4y) + 3b(2a) + 3b(3b) + 3b(- 4y) - 4y(2a) - 4y(3b) - 4y(- 4y)
4a² + 6ab - 8ay + 6ab + 9b² - 12by - 8ay - 12by + 16y²
4a² + 6ab + 6ab + 9b² - 12by - 12by - 8ay - 8ay + 16y²
4a² + 12ab + 9b² - 24by - 16ay + 16y²