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Simplify \(\frac{1 + \sqrt{8}}{3 - \sqrt{2}}\).

Further Mathematics
WAEC 2014

Simplify \(\frac{1 + \sqrt{8}}{3 - \sqrt{2}}\).

  • A. \(7 + \sqrt{2}\)
  • B. \(7 + 7\sqrt{2}\)
  • C. \(1 - 7\sqrt{2}\)
  • D. \(1 + \sqrt{2}\)
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Correct Answer: Option D
Explanation

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

Rationalizing by multiplying through with \(3 + \sqrt{2}\),

\((\frac{1 + \sqrt{8}}{3 - \sqrt{2}})(\frac{3 + \sqrt{2}}{3 + \sqrt{2}}) = \frac{3 + \sqrt{2} + 3\sqrt{8} + 4}{9 - 2}\)

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

= \(\frac{7 + 7\sqrt{2}}{7} = 1 + \sqrt{2}\)


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Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
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