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JAMB Mathematics 1980 Question 8

Question 8

Quadratic Equations

Find the roots of the equation 10x2 − 13x − 3 = 0

  1. A.x = 3/5 or −1/3
  2. B.x = 3/10 or −1
  3. C.x = −3/10 or 1
  4. D.x = 1/5 or −3/2
  5. E.x = −1/5 or 3/2
Show the answer and explanation

Answer: E (x = −1/5 or 3/2)

Explanation

10x² − 13x − 3 = (5x + 1)(2x − 3) = 0, so x = −1/5 or 3/2.