JAMB - Mathematics (2018 - No. 49)
Evaluate ∫\(^2_1\) \(\frac{5}{x}\) dx
1.47
2.67
3.23
3.47
Explication
∫\(\frac{5}{x}\) 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