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= (9a - 3a² - 12 - 4a)(a - 5)
= (5a - 3a² - 12)(a - 5)
= (5a² - 25a + 3a³ + 15a² - 12a + 60)
= 3a³ + 20a² - 37a + 60
(5n - 2)(2n - 1)²
=(5n - 2)(4n² - 4n + 1)
= 20n³ - 20n² + 5n - 8n² + 8n - 2
= 20n³ - 28n² + 13n - 2