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

Further Mathematics
WAEC 2017

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

  • A. \(1- \frac{1}{2}\sqrt{3}\)
  • B. \(1+ \frac{1}{2}\sqrt{3}\)
  • C. \(\sqrt{3}\)
  • D. \(1+\sqrt{3}\)
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Correct Answer: Option B
Explanation

\(\frac{1}{(1-\sqrt{3})^{2}}\) 

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

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

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

After rationalising (multiplying the denominator and numerator with \(4+2\sqrt{3}\), we have

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


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WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
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WAEC May/June 2024 - Practice for Objective & Theory - From 1988 till date, download app now - 99995
WAEC May/June 2024 - Practice for Objective & Theory - From 1988 till date, download app now - 99995
WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
WAEC offline past questions - with all answers and explanations in one app - Download for free
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