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A binary operation * is defined on the set R of real numbers by a*b...

Further Mathematics
WAEC 2025

A binary operation * is defined on the set R of real numbers by a*b = \(\frac{\text{ab}}{4}\), find the value of \(\sqrt{2}\) * \(\sqrt{6}\)

  • A. 3\(\frac{\sqrt{2}}{4}\)
  • B. \(\frac{\sqrt{2}}{2}\)
  • C. \(\frac{\sqrt{3}}{2}\)
  • D. \(\sqrt{3}\)
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Correct Answer: Option C
Explanation

a*b = \(\frac{\text{ab}}{4}\)

\(\sqrt{2}\) * \(\sqrt{6}\) = \(\frac{\text{ab}}{4}\)

\(\sqrt{2}\) * \(\sqrt{6}\) = \(\frac{\sqrt{2} \times \sqrt{6}}{4}\)

= \(\frac{\sqrt{12}}{4}\) = \(\frac{\sqrt{4} \times \sqrt{3}}{4}\) = \(\frac{2\sqrt{3}}{4}\) = \(\frac{\sqrt{3}}{2}\).


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