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JAMB Mathematics 2002 Question 4

Question 4

Surds

Simplify (√0.7 + √70)2

  1. A.84.7
  2. B.70.7
  3. C.217.7
  4. D.168.7
Show the answer and explanation

Answer: A (84.7)

Explanation

Expand: 0.7 + 70 + 2√(0.7 × 70) = 70.7 + 2√49 = 70.7 + 14 = 84.7.