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JAMB Mathematics 1979 Question 12

Question 12

Quadratic Equations

The solution of the equation x2 − 2x = 8 is

  1. A.x = 0 or 2
  2. B.x = −2 or 4
  3. C.x = 2
  4. D.x = −4
  5. E.x = 2 or 4.
Show the answer and explanation

Answer: B (x = −2 or 4)

Explanation

x² − 2x − 8 = 0 factorises as (x + 2)(x − 4) = 0, so x = −2 or 4.