Question on: JAMB Mathematics - 2018

Evaluate ∫\(^2_1\) \(\frac{5}{x}\) dx

A
1.47
B
2.67
C
3.23
D
3.47
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Correct Option: D

∫\(\frac{5}{x}\) dx = 5 ∫\(\frac{1}{x}\) = 5Inx

  Since the integral of \(\frac{1}{x}\) is Inx

  ∫\(^2\) \(_1\)∫ \(\frac{5}{x}\) dx = 5

  dx = 5 (In<2 – InIn1)

  = 3.4657

  = 3.47

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