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If \(b^3\) = \(a^{-2}\) and \(c^{\frac{1}{3}}\) = \(a^\frac{1}{2}\)b, express c in terms of a

Mathematics
JAMB 1998

If \(b^3\) = \(a^{-2}\) and \(c^{\frac{1}{3}}\) = \(a^\frac{1}{2}\)b, express c in terms of a

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

\(c^{\frac{1}{3}}\) = \(a^{\frac{1}{2}}\)b

b = \(a^{-2}\) and \(c^{\frac{1}{3}}\) = \(a^{\frac{1}{2}}\)b

b = \(a^{-\frac{2}{3}}\) 

\(c^{\frac{1}{3}}\) = \(a^{\frac{1}{2}}\) x \(a^{-\frac{2}{3}}\) = \(a^{-\frac{1}{6}}\)

take the cube of both sides

c = (\(a^{-\frac{1}{6}})^3\) = \(a^{-\frac{1}{2}}\)


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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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WAEC and NECO CBT App for Mobile Devices - Candidates, Schools, Centres, Resellers - 100% Offline -Download Now
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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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