What is the integral from 1 to 4 of 1/((1+sqrt(x))) ?

The integral from 1 to 4 of 1/((1+sqrt(x))) is 2(1-ln(3)+ln(2))

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integral from 1 to 4 of 1/((1+sqrt(x)))

\int_{1}^{4} \frac{1}{( 1 + x )} d x

2 (1 - ln (3) + ln (2))

Decimal

1.18906 \dots

Solution steps

\int_{1}^{4} \frac{1}{1 + x} d x

Apply u-substitution

= \int_{2}^{3} \frac{2 ( u - 1 )}{u} d u

Take the constant out:

\int a \cdot f (x) d x = a \cdot \int f (x) d x

= 2 \cdot \int_{2}^{3} \frac{u - 1}{u} d u

Expand

\frac{u - 1}{u} : 1 - \frac{1}{u}

= 2 \cdot \int_{2}^{3} 1 - \frac{1}{u} 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

= 2 (\int_{2}^{3} 1 d u - \int_{2}^{3} \frac{1}{u} d u)

\int_{2}^{3} 1 d u = 1

\int_{2}^{3} \frac{1}{u} d u = ln (3) - ln (2)

= 2 (1 - (ln (3) - ln (2)))

Simplify

= 2 (1 - ln (3) + ln (2))

What is the integral from 1 to 4 of 1/((1+sqrt(x))) ?
The integral from 1 to 4 of 1/((1+sqrt(x))) is 2(1-ln(3)+ln(2))