Choose the correct answers for the following questions.(1) Which one is the quadratic equation ? (A) 5x-3=x2 (B) x(x + 5) = 2 (C) n – 1 = 2n (D) 1x2x+2=x (2) Out of the following equations which one is not a quadratic equation ? (A) x2 + 4x = 11 + x2 (B) x2 = 4x (C) 5x2 = 90 (D) 2x – x2 = x2 + 5 (3) The roots of x2 + kx + k = 0 are real and equal, find k. (A) 0 (B) 4 (C) 0 or 4 (D) 2 (4) For 2x2-5x+2=0 find the value of the discriminant. (A) –5 (B) 17 (C) 2 (D) 22-5 (5) Which of the following quadratic equations has roots 3,5 ? (A) x2 – 15x + 8 = 0 (B) x2 – 8x + 15 = 0 (C) x2 + 3x + 5 = 0 (D) x2 + 8x – 15 = 0 (6) Out of the following equations, find the equation having the sum of its roots –5. (A) 3x2 – 15x + 3 = 0 (B) x2 – 5x + 3 = 0 (C) x2 + 3x – 5 = 0 (D) 3x2 + 15x + 3 = 0 (7) 5m2-5m+5=0 which of the following statement is true for this given equation ? (A) Real and uneual roots (B) Real and equal roots (C) Roots are not real (D) Three roots. (8) One of the roots of equation x2 + mx – 5 = 0 is 2; find m. (A) –2 (B) -12 (C) 12 (D) 2