1) (4y² + 3)² + (9 - 4y²)² - 2(4y² + 3)(4y² - 9) =
= (4y² + 3)² - 2(4y² + 3)(4y² - 9)+ (4y² - 9)² = (4y² + 3 - 4y² + 9)² =
= 12² = 144
2) (a - 8)(a - 7) - (a - 9)² = a² - 7a - 8a + 56 - a² + 18a - 81 = 3a - 25
1) (4y² + 3)² + (9 - 4y²)² - 2(4y² + 3)(4y² - 9) =
= (4y² + 3)² - 2(4y² + 3)(4y² - 9)+ (4y² - 9)² = (4y² + 3 - 4y² + 9)² =
= 12² = 144
2) (a - 8)(a - 7) - (a - 9)² = a² - 7a - 8a + 56 - a² + 18a - 81 = 3a - 25