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JAMB Mathematics 1992 Question 4

Question 4

Indices

What is the value of x satisfying the equation 42x/43x = 2?

  1. A.−2
  2. B.−½
  3. C.½
  4. D.2
Show the answer and explanation

Answer: B (−½)

Explanation

42x/43x = 4−x = 2−2x. Setting 2−2x = 21 gives −2x = 1, so x = −½.