999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999 nhu vay phai khong

Trong mặt phẳng Oxy cho parabol (P) có phương trình y   =   4 x 2   -   7 x   +   3 . Phép đối xứng trục Oy biến (P) thành (P’) có phương trình:

A. y   =   4 x 2   +   7 x   -   3  

B.  y   =   4 x 2   +   7 x   +   3

C.  y   =   - 4 x 2   +   7 x   -   3

D.  y   =   - 4 x 2   -   7 x   +   3