(-9a + 4b)² = (-9a)² + 2 \((-9a)\)(4b) + (4b)² = 81a² - 72ab + 16b²
(x² + 5)² = (x²)² + 2(x²)(5) + 5² = x⁴ + 10x² + 25
(2a + y)³ = (2a)³ + 3(2a)²(y) + 3(2a)(y)² + y³ = 8a³ + 12a²y + 6ay² + y³
(b - 3)³ = b³ - 3(b²)(3) + 3(b)(3²) - 3³ = b³ - 9b² + 27b - 27
b² + 10b + 25 = (b + 5)²
4c² - 12c + 9 = (2c - 3)²
Ответ: 1) 81a² - 72ab + 16b² 2) x⁴ + 10x² + 25 3) 8a³ + 12a²y + 6ay² + y³ 4) b³ - 9b² + 27b - 27 5) (b + 5)² 6) (2c - 3)²