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Question on: JAMB Mathematics - 1998

Express in partial fractions \(\frac{11 + 2}{6x^2 - x - 1}\)
A
\(\frac{1}{3x - 1}\) + \(\frac{3}{2x + 1}\)
B
\(\frac{3}{3x + 1}\) - \(\frac{1}{2x - 1}\)
C
\(\frac{3}{3x + 1}\) - \(\frac{1}{2x - 1}\)
D
\(\frac{1}{3x + 1}\) + \(\frac{3}{2x - 1}\)
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Correct Option: D
\(\frac{11 + 2}{6x^2 - x - 1}\) = \(\frac{11 + 2}{3x + 1}\)

= \(\frac{A}{3x + 1}\) + \(\frac{B}{2x - 1}\)

11x = 2 = A(2x - 1) + B(3x + 1)

put x = \(\frac{1}{2}\)

= -\(\frac{-5}{3}\)

= -\(\frac{-5}{3}\)A \(\to\) A = 1

∴ \(\frac{11x +2}{6x^2 - x - 1}\) = \(\frac{1}{3x + 1}\) + \(\frac{3}{2x - 1}\)

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