1. Which of the following is a perfect square number? A、8 B. 24 C. 125 D. 121 2. All of the following expressions are perfect squares, EXCEPT one. What is it? A. 12a2b2 B. x2y6 C. 16a2b6 D. 25x6y8 3. Which of the following is equal to 2x-12 ? A. 4x2+4x+1 c, 4x2-4x+1 B. 2x2+2x+1 D. 4x2-4x-1 4. Which of the following is a perfect square trinomial? A, x2+6x+9 c. 4x2+20xy+9y2 B. 4x2-20x-25 D. 9a2-6a2bc+a2b2c2 5. All of the following are perfect square trinomials, EXCEPT one. Which is it? A. x2-4xy+4y2 C, 4x2-12xy+9y2 B. 9a2+24a-16 D. x2y2-6x3y2+9x4y2 6. If one factor of a perfect square trinomial is 2xy-3x , what is the other factor? A, 2y-3x B. 2y+3x C, 2xy-3x D, 2xy+3x 7. Which of the following is equal to x2-6xy+9y2 ? A, x-3y2 B. x+3y2 C, 2x-3y2 D. 2x+3y2