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Find \(\int \frac{x^{3} + 5x + 1}{x^{3}} \mathrm {d} x\)

Further Mathematics
WAEC 2015

Find \(\int \frac{x^{3} + 5x + 1}{x^{3}} \mathrm {d} x\)

  • A. \(x^{2} + 10x + c\)
  • B. \(x + \frac{5}{3}x^{3} + x^{4} + c\)
  • C. \(x - 5x^{2} - 2x^{3} + c\)
  • D. \(x - \frac{5}{x} - \frac{1}{2x^{2}} + c\)
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Correct Answer: Option D
Explanation

\(\frac{x^{3} + 5x + 1}{x^{3}} \equiv  1 + \frac{5}{x^{2}} + \frac{1}{x^{3}}\)

\(\equiv \int (1 + \frac{5}{x^{2}} + \frac{1}{x^{3}}) \mathrm {d} x = \int (1 + 5x^{-2} + x^{-3}) \mathrm {d} x\)

= \((x - 5x^{-1} - \frac{1}{2}x^{-2} + c)\)

= \(x - \frac{5}{x} - \frac{1}{2x^{2}} + c\).


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