Solve the following equation frac 2 2r - 1 - fr... - JAMB Mathematics 2021 Question
Solve the following equation: \(\frac{2}{(2r - 1)}\) - \(\frac{5}{3}\) = \(\frac{1}{(r + 2)}\)
A
( -1,\(\frac{5}{2}\) )
B
( 1, - \(\frac{5}{2}\) )
C
( \(\frac{5}{2}\), 1 )
D
(2,1)
correct option: b
Given: \(\frac{2}{(2r - 1)}\) - \(\frac{5}{3}\) = \(\frac{1}{(r + 2)}\),
\(\frac{2}{(2r - 1)}\) - \(\frac{1}{(r + 2)}\) = \(\frac{5}{3}\)
L.C.M. => (2r - 1) (r + 2)
\(\frac{2(r + 2) - 1(2r - 1)}{(2r - 1) (r + 2)}\) = \(\frac{5}{3}\)
\(\frac{2r + 4 - 2r + 1}{ (2r - 1) (r + 2)}\) = \(\frac{5}{3}\)
3 = (2r - 1) (r + 2) or 2r\(^2\) + 3r - 2
2r\(^2\) + 3r - 2 - 3 = 0
2r\(^2\) + 3r - 5 = 0
x = 1 or - \(\frac{5}{2}\)
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