б) b² + 10b + 25 = (b + 5)(b + 5) = (b + 5)²
в) 25x² - 16 = (5x + 4)(5x - 4)
г) 9x² - 12xy + 4y² = (3x - 2y)(3x - 2y) = (3x - 2y)²
б) b² + 10b + 25 = (b + 5)(b + 5) = (b + 5)²
в) 25x² - 16 = (5x + 4)(5x - 4)
г) 9x² - 12xy + 4y² = (3x - 2y)(3x - 2y) = (3x - 2y)²