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Simplify \(4 - \frac{1}{2 - \sqrt{3}}\)

Mathematics
JAMB 1989

Simplify \(4 - \frac{1}{2 - \sqrt{3}}\)

  • A. 2\(\sqrt{3}\)
  • B. -2 - \(\sqrt{3}\)
  • C. -2 + \(\sqrt{3}\)
  • D. 2 - \(\sqrt{3}\)
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Correct Answer: Option D
Explanation

\(4 - \frac{1}{2 - \sqrt{3}} = \frac{4(2 - \sqrt{3}) - 1}{2 - \sqrt{3}}\)

= \(\frac{8 - 4\sqrt{3} - 1}{2 - \sqrt{3}}\)

= \(\frac{7 - 4\sqrt{3}}{2 - \sqrt{3}}\)

Rationalizing,

\((\frac{7 - 4\sqrt{3}}{2 - \sqrt{3}}) (\frac{2 + \sqrt{3}}{2 + \sqrt{3}})\)

= \(\frac{14 + 7\sqrt{3} - 8\sqrt{3} - 12}{4 + 2\sqrt{3} - 2\sqrt{3} - 3}\)

= \(\frac{2 - \sqrt{3}}{1} = 2 - \sqrt{3}\)


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