Phương trình Đi ô phăng là gì vậy ? Có thế viết ví dụ và giải ví dụ cho mình được ko?

Tìm GTLN của biểu thức \(\dfrac{6x^2+21x+22}{x^2+4x+4}\). Giúp mình được không ạ, mình cảm ơn trước 

Giúp mình với

Change active to passive, pay attention to the special structure.

1. Parents always give me proper encouragement

2. Someone saw him pick up the gun

3. I saw her crying.

4, They believe that the red is lucky colour.

 5. They say that exercise is good for health.

6. He let me sit down.

7. My father made me finish my homework before going to bed.

8. I had him repair my car.

9. I get her to make some coffee.

10. People say that Hai eats ten eggs a day.

11. They  think that Mary has gone away.

12. Nobody told me that Ben was ill.

13.Open your book.

14.Take off your hat.

15.Don’t do that silly thing again.

16.Let’s tell them about it.

17.Don’t let the other see you.