Cho phương trình: \(x^2\)- 3x + m - 3 = 0. Tìm m để phương trình có 2 nghiệm x1, x2 thỏa mãn: \(x1^2\) + 3x2 = \(x1^2\)\(x2^2\) - 11

Các bạn giúp mình xem có chỉnh sửa ở đâu không nhé: 

Vietnam is not only famous for its development but also for its majestic natural wonders. Recognized as one of the seven natural wonders of the world, Ha Long Bay is an amazing tourist attraction in the north of Vietnam, which is located in Quang Ninh province. Ha Long Bay attracts tourists due to its breathtaking views, natural beauties and Geological values.The complex includes 1,969 islands of various sizes, 989 of which have been given names such as Hon Rong (Dragon Islet), Hon Trong Mai (Cock and Hen Islet)…Going there , you can lie on the beach, swim or dive to see the coral reefs and enjoy the fresh air. Remember to buy some special dishes, handicrafts and enjoy local foods. I really love nature and people here, visiting Ha Long is a memorable experience. In the future, I hope Ha Long Bay will develop and become more popular over the world.

Các bạn kiểm tra giúp mình xem có lỗi chính tả ở đâu không ạ, mai mình thi rồi:

I have long dreamed of going to Ho Chi Minh City. It is the largest and most developed city in my country. Ho Chi Minh City has favorable climatic conditions and geographical position. Coming to this bustling city, you can experience many interesting places, such as Ban Nguyet Lake and Anh Sao Bridge. Ban Nguyet Lake is one of the focal points of Saigon with shimmering, sparkling scenery where people can enjoy comfortable and peaceful by its large and airy space. Besides that, Ho Chi Minh City is also famous for many developed economic activities, especially industry and services. People here are very sociable and friendly, they are ready to help each other. I love Ho Chi Minh city. I hope everyone can come here once and feel the good things about it.

Kiểm tra giúp mình với ạ!

 Cho đường tròn tâm O và điểm M nằm ngoài đường tròn đó. Qua M kẻ các tiếp tuyến MA, MB. Lấy điểm C thuộc (O) (C, M nằm trên cùng 1 nửa mặt phẳng bờ AB). Qua C kẻ tiếp tuyến thứ ba cắt MA và MB tại D và E.

a. CMR: Chu vi MDE = 2MA

b. Kẻ đường kính AOF và CH ⊥ AF tại H. CM: FD cắt CH tại trung điểm I của CH