Cho hàm số \(y = f\left( x \right) = a{x^2} + bx +...
Câu hỏi: Cho hàm số \(y = f\left( x \right) = a{x^2} + bx + c\) có đồ thị như hình vẽ và \(\Delta = {b^2} - 4ac\). Xác định dấu của a và \(\Delta\)?![](data:image/png;base64,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)
A. \(a > 0,\Delta = 0\)
B. \(a < 0,\Delta > 0\)
C. \(a < 0,\Delta = 0\)
D. \(a > 0,\Delta > 0\)
Câu hỏi trên thuộc đề trắc nghiệm
Đề thi HK1 môn Toán 10 năm học 2019 - 2020 Trường THPT Triệu Quang Phục