1) (2a + 5)² - 3(a - 7)(7 - a) + 9a² - 79; 2) - (2a - 3)² – 5(3a − 7)(4 + a) − 3a² − 2; - 3) (3 - 2a)² + 2(a − 8)(4- a) - 5a² - 7; 4) 3(5 - 2a)² - 4(3a - 5)(7- a) + 15a² - 6. -​
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