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Cho hàm số y=ax2−bxx−1 a) Tìm a và b biết rằng đồ thị (C) của hàm số đã cho đi qua điểm A(−1;52) và tiếp tuyến của (C) tại điểm O(0;0) có hệ số góc bằng −3 b) Khảo sát sự biến thiên và vẽ đồ thị của hàm số với các giá trị của a và b đã tìm được {Giúp nhé }
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