C. Directions: Read and analyze each item. Choose the letter of the correct answer and write it on the space provided before each number.
11. Which of the following equations represents a quadratic function? A. y = 3 + 2x2 B. 2y2 + 3 = x C. y = 3x - 22 D. y = 2* - 3
12. What must be added to the expression x2 - 6x +___ to make it a perfect square trinomial? A.6 B.9 C.10 D.12
13. Which of the following is the vertex for of the equation y = x2 - 4x + 1 A. y = (x - 2)2 + 3 B. y = (x + 2)2 + 3 C. y = (x - 2)2 - 3 D. y = (x + 2)2 - 3
14. Complete the statement. Quadratic functions are equations of the form y = ax2 + bx + c where a, b and c are real numbers and A. a = 0 B. a 70 C. a so D. a > 0
