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Make R the subject of the formula S = \(\sqrt{\frac{2R + T}{2RT}}\)

Mathematics
JAMB 1989

Make R the subject of the formula S = \(\sqrt{\frac{2R + T}{2RT}}\)

  • A. R = \(\frac{T}{(TS^2 + 1)}\)
  • B. R = \(\frac{T}{2(TS^2 - 1)}\)
  • C. R = \(\frac{T}{2(TS^2 + 1)}\)
  • D. R = \(\frac{R}{2(TS^2 + 1)}\)
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Correct Answer: Option B
Explanation

S = \(\sqrt{\frac{2R + T}{2RT}}\)

Squaring both sides, 

\(S^{2} = \frac{2R + T}{2RT}\)

\(S^{2} (2RT) = 2R + T\)

\(2S^{2} RT - 2R = T\)

\(R = \frac{T}{2TS^{2}  - 2}\)

= \(\frac{T}{2(TS^2 - 1)}\)


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