9x ^ 2 x y 6 July 8, 2019 16 32 64 128 Y x 2 9x 6 Z x 2 xy y 2 9x 6y 20 2 x y )+ 9x 6y Y x 2 9x 6 in vertex form Y x 2 9x 6 y 3x 1 9x 6y x z 2 và x y z 27 X 2 y 2 9x 2y x 6y 59 2x 9 6xy - 4y + 6 - 9x 9 x 8 =
