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JAMB Mathematics 1981 Question 33

Question 33

Quadratic Equations

The positive root of t in the following equation, 4t2 + 7t − 1 = 0, correct to 4 places of decimal is

  1. A.1.0622
  2. B.10.6225
  3. C.0.1328
  4. D.0.3218
  5. E.2.0132.
Show the answer and explanation

Answer: C (0.1328)

Explanation

t = (−7 + √(49 + 16))/8 = (−7 + 8.0623)/8 ≈ 0.1328.