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Simplify 25\(^{(\frac{1}{2}}\) × 8\(^{(\frac{-2}{3}}\)

Mathematics
JAMB 2018

Simplify 25\(^{(\frac{1}{2}}\) × 8\(^{(\frac{-2}{3}}\)

  • A. 1\(\frac{1}{4}\)
  • B. 2\(\frac{1}{4}\)
  • C. 6
  • D. 10
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Correct Answer: Option A
Explanation

Using law of indices

25\(^{(\frac{1}{2}}\) × 8\(\frac{-2}{3}\)

  = \(\sqrt{25}\) x (\(\sqrt[3]{8}\))\(^{ -2}\)

  = 5 x 2\(^{-2}\)

  = 5 x \(\frac{1}{2^2}\) =

 \(\frac{5}{4}\) = \(\frac{11}{4}\)

  The answer is A

There is an explanation video available below.


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Explanation Video

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