Evaluate \(\frac{(0.5652)^2 – (0.4375)^2}{0.04}\) correct to three significant figures

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Mathematics JAMB 2007

Evaluate \(\frac{(0.5652)^2 – (0.4375)^2}{0.04}\) correct to three significant figures

  • 3.11
  • 3.13 checkmark
  • 0.313
  • 3.12

The correct answer is: B

Explanation

\(\frac{(0.5652)^2) -  (0.4375)^2}{0.04}\)
\(\frac{(0.5625 + 0.4375)(0.5625 - 0.4375)}{0.04}\)
\(\frac{1.000\times 0.125}{0.04}\)
= 3.125
= 3.13

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