4. Which of the following is the same as 4x -9 ? A. (2x + 3) B.(2x - 3)? C. (2x + 3)(2x - 3) D. 4(x2-9) 5. Which of the following is a perfect square number? A. 8 B. 24 C. 121 D. 125 6. Which of the following is equal to (2x - 1)?? A. 4x2 + 4x + 1 B. 2x2 - 2x + 1 C. 4x2 - 4x + 1 D. 4x2 - 4x - 1 7. Which of the following is a perfect square trinomial? A. x² + 6x + 9 B. 4x2 - 20x - 25 C. 4x² + 20xy+9y² D. 9x2 - 6abc + abºc? 8. Which of the following is equal to x2 - 6xy + 9y?? A. (x + 3y) B. (2x - 3y) C. (2x + 3y) D. (x-3y)​