What is the integral from 1 to 2 of (1+1/u+1/(u^2)) ?

The integral from 1 to 2 of (1+1/u+1/(u^2)) is ln(2)+3/2

integral from 1 to 2 of (1+1/u+1/(u^2))

\int_{1}^{2} (1 + \frac{1}{u} + \frac{1}{u ^{2}}) d u

ln (2) + \frac{3}{2}

Decimal

2.19314 \dots

Solution steps

\int_{1}^{2} 1 + \frac{1}{u} + \frac{1}{u ^{2}} d u

Apply the Sum Rule:

\int f (x) \pm g (x) d x = \int f (x) d x \pm \int g (x) d x

= \int_{1}^{2} 1 d u + \int_{1}^{2} \frac{1}{u} d u + \int_{1}^{2} \frac{1}{u ^{2}} d u

\int_{1}^{2} 1 d u = 1

\int_{1}^{2} \frac{1}{u} d u = ln (2)

\int_{1}^{2} \frac{1}{u ^{2}} d u = \frac{1}{2}

= 1 + ln (2) + \frac{1}{2}

Combine the fractions

1 + \frac{1}{2} : \frac{3}{2}

= ln (2) + \frac{3}{2}

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What is the integral from 1 to 2 of (1+1/u+1/(u^2)) ?
The integral from 1 to 2 of (1+1/u+1/(u^2)) is ln(2)+3/2