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WAEC Mathematics 2008 Question 2

Question 2

Fractions, Decimals and Approximation

Evaluate ((3.2)2 − (4.8)2)/(3.2 + 4.8)

  1. A.−0.80
  2. B.−1.60
  3. C.−10.24
  4. D.−12.80
Show the answer and explanation

Answer: B (−1.60)

Explanation

Difference of two squares: (3.2 − 4.8)(3.2 + 4.8)/(3.2 + 4.8) = 3.2 − 4.8 = −1.60.