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Solve the following equation \(\frac{2}{2r - 1}\) - \(\frac{5}{3}\) = \(\frac{1}{r + 2}\)

Mathematics
JAMB 1985

Solve the following equation \(\frac{2}{2r - 1}\) - \(\frac{5}{3}\) = \(\frac{1}{r + 2}\)

  • A. (\(\frac{5}{2}\), 1)
  • B. (5, -4)
  • C. (2, 1)
  • D. (1, \(\frac{-5}{2}\))
  • E. (1,-2)
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Correct Answer: Option D
Explanation

\(\frac{2}{2r - 1}\) - \(\frac{5}{3}\) = \(\frac{1}{r + 2}\)

\(\frac{2}{2r - 1}\) - \(\frac{1}{r + 2}\) = \(\frac{5}{3}\)

\(\frac{2r + 4 - 2r + 1}{2r - 1 (r + 2)}\) = \(\frac{5}{3}\)

\(\frac{5}{(2r + 1)(r + 2)}\) = \(\frac{5}{3}\)

5(2r - 1)(r + 2) = 15

(10r - 5)(r + 2) = 15

\(10r^2\) + 20r - 5r - 10 = 15

\(10r^2\) + 15r = 25

\(10r^2\) + 15r - 25 = 0

\(2r^2\) + 3r - 5 = 0

(\(2r^2 + 5r)\)(2r + 5) = r(2r + 5) - 1(2r + 5)

(r - 1)(2r + 5) = 0

r = 1 or \(\frac{-5}{2}\)


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WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
WAEC offline past questions - with all answers and explanations in one app - Download for free
WAEC May/June 2024 - Practice for Objective & Theory - From 1988 till date, download app now - 99995
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
WAEC offline past questions - with all answers and explanations in one app - Download for free
WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
WAEC May/June 2024 - Practice for Objective & Theory - From 1988 till date, download app now - 99995