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JAMB Mathematics 1986 Question 21

Question 21

Quadratic Equations

Solve the equation 3x2 + 6x − 2 = 0

  1. A.x = −1 ± √3/3
  2. B.x = −1 ± √15/3
  3. C.x = −2 ± 2√3/3
  4. D.x = −2 ± 2√15/3
Show the answer and explanation

Answer: B (x = −1 ± √15/3)

Explanation

x = (−6 ± √(36 + 24))/6 = (−6 ± 2√15)/6 = −1 ± √15/3.