Higher Math
111
Exercise 5.7 1. ax 2 + bx + c = 0 where a, b, c are real numbers. What is the value of b in the equation x 2 − x − 12 = 0 ? A. 0 B. 1 C. − 1 D. 3 x 2. What is the solution of the equation 16 = 4x+1? A. 2 B. 0 C. 4 D. 3 3. Which one is a solution of the equation x 2 − x + 13 = 0 ? − 1+ − 51 2
− 1− 51 2 1+ 51 1 + − 51 C. D. 2 2 4. What is the correct solution of yx = 9, y2 = 3x ? 1 1 A. (2, 3), (−2, ) B. (2, −2), (3, ) 9 9 1 1 C. (2, ), (−2, 3) D. (−2, − ), (2, 3) 9 9 Answer to the question nos. 5 and 6 on the basis of the information given below: The difference of the squares of two positive whole numbers is 11 and the product of the numbers is 30. 5. What are the numbers ? A. 1 and 30 B. 2 and 15 C. 5 and 6 D. 5 and − 6 6. What is the sum of the squares of the numbers ? A. 1 B. 5 C. 41 D. 41 7. The sum of a number and its multiplicative inverse is 6. The formation of equation is 1 i. x + = 6 x ii. x2 + 1 = 6x iii. x2 – 6x – 1 = 0 Which one is true? A. i & ii B. i & iii C. ii & iii D. i, ii & iii A.
B.