(3a - 4b)² + 24ab = 9a² - 24ab + 16b² + 24ab = 9a² + 16b²
64 -(9n-8)² = 64 - 81n² - 144n + 64 = 128 - 81n² - 144n = 81n² + 144n - 128
(3y +2)² - 24(0,5y + 1) = 9y² + 12y + 4 - 12y - 24 = 9y²- 20
(5d + 1)² +5(1 - 2d) = 25d² + 10d + 1 + 5 - 10d = 25d² + 6