A) X2 + 2X + 4 B) (X – 2) (X + 2) C) X2 + 4X + 4 D) 2X + 4

Câu 4. (x + 2)

2

= ? A) x

2

+ 2x + 4 B) (x – 2) (x + 2) C) x

2

+ 4x + 4 D) 2x + 4