28.33. a) \(3(x - y)^2\); б) \(-c(3a + c)^2\); в) \(-6(5m - n)^2\); г) \(b(1 + 2b)^2\)

**28.33** * **a)** \(3(x - y)^2 = 3(x^2 - 2xy + y^2) = 3x^2 - 6xy + 3y^2\) * **б)** \(-c(3a + c)^2 = -c(9a^2 + 6ac + c^2) = -9a^2c - 6ac^2 - c^3\) * **в)** \(-6(5m - n)^2 = -6(25m^2 - 10mn + n^2) = -150m^2 + 60mn - 6n^2\) * **г)** \(b(1 + 2b)^2 = b(1 + 4b + 4b^2) = b + 4b^2 + 4b^3\)