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UI Post-UTME Mathematics 2013 Question 1

Question 1

Surds

Solve the equation √(x + 8) + √(x + 1) = 7

  1. A.3
  2. B.4
  3. C.8
  4. D.9
Show the answer and explanation

Answer: C (8)

Explanation

Check x = 8: √16 + √9 = 4 + 3 = 7. (Squaring twice also leads to √(x + 1) = 3, so x = 8.)