A, X2 + 2X -1; B, X2 + 2X +1; C, X2 - 2X -1; D, X2 - 2X +1

33) (x - 1)

2

Bằng: A, x

2

+ 2x -1; B, x

2

+ 2x +1; C, x

2

- 2x -1; D, x

2

- 2x +1.