What is the integral of (sqrt(1+4x^2))/x ?

The integral of (sqrt(1+4x^2))/x is -1/2 ln|sqrt(1+4x^2)+1|+1/2 ln|sqrt(1+4x^2)-1|+sqrt(1+4x^2)+C

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integral of (sqrt(1+4x^2))/x

\int \frac{1 + 4 x ^{2}}{x} d x

- \frac{1}{2} ln 1 + 4 x^{2} + 1 + \frac{1}{2} ln 1 + 4 x^{2} - 1 + 1 + 4 x^{2} + C

Solution steps

\int \frac{1 + 4 x ^{2}}{x} d x

Apply u-substitution

= \int \frac{1 + 4 u}{2 u} d u

Take the constant out:

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

= \frac{1}{2} \cdot \int \frac{1 + 4 u}{u} d u

Apply u-substitution

= \frac{1}{2} \cdot \int \frac{2 v ^{2}}{v ^{2} - 1} d v

Take the constant out:

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

= \frac{1}{2} \cdot 2 \cdot \int \frac{v ^{2}}{v ^{2} - 1} d v

Factor

v^{2} - 1 : - (- v^{2} + 1)

= \frac{1}{2} \cdot 2 \cdot \int \frac{v ^{2}}{- ( - v ^{2} + 1 )} d v

Take the constant out:

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

= \frac{1}{2} \cdot 2 (- \int \frac{v ^{2}}{- v ^{2} + 1} d v)

\frac{v ^{2}}{- v ^{2} + 1} = \frac{1}{- v ^{2} + 1} - 1

= \frac{1}{2} \cdot 2 (- \int \frac{1}{- v ^{2} + 1} - 1 d v)

Apply the Sum Rule:

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

= \frac{1}{2} \cdot 2 (- (\int \frac{1}{- v ^{2} + 1} d v - \int 1 d v))

\int \frac{1}{- v ^{2} + 1} d v = \frac{ln ∣ v + 1 ∣}{2} - \frac{ln ∣ v - 1 ∣}{2}

\int 1 d v = v

= \frac{1}{2} \cdot 2 (- (\frac{ln ∣ v + 1 ∣}{2} - \frac{ln ∣ v - 1 ∣}{2} - v))

Substitute back

= \frac{1}{2} \cdot 2 (- (\frac{ln 1 + 4 x ^{2} + 1}{2} - \frac{ln 1 + 4 x ^{2} - 1}{2} - 1 + 4 x^{2}))

Simplify

\frac{1}{2} \cdot 2 (- (\frac{ln 1 + 4 x ^{2} + 1}{2} - \frac{ln 1 + 4 x ^{2} - 1}{2} - 1 + 4 x^{2})) : - \frac{1}{2} ln 1 + 4 x^{2} + 1 + \frac{1}{2} ln 1 + 4 x^{2} - 1 + 1 + 4 x^{2}

= - \frac{1}{2} ln 1 + 4 x^{2} + 1 + \frac{1}{2} ln 1 + 4 x^{2} - 1 + 1 + 4 x^{2}

Add a constant to the solution

= - \frac{1}{2} ln 1 + 4 x^{2} + 1 + \frac{1}{2} ln 1 + 4 x^{2} - 1 + 1 + 4 x^{2} + C

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What is the integral of (sqrt(1+4x^2))/x ?
The integral of (sqrt(1+4x^2))/x is -1/2 ln|sqrt(1+4x^2)+1|+1/2 ln|sqrt(1+4x^2)-1|+sqrt(1+4x^2)+C