Lizethvail6372 Lizethvail6372 23-05-2023 Mathematics contestada Problems for practice Use the D Operator method to solve the following differential equa- tions: 1. ²y + y + 2y = eª d da 2. D²y + 4Dy + 3y = 6 3. D²y - y = 12x²e* 4. D²y + 4Dy = x³ 5. D²y + 4Dy + 4y = e-3 6. D²y +9y = 8sin2x 7. D²y + 4y = = 3cos3x