What is the integral of 4/(xsqrt(1+9x^2)) ?

The integral of 4/(xsqrt(1+9x^2)) is -4(1/2 ln|sqrt(1+9x^2)+1|-1/2 ln|sqrt(1+9x^2)-1|)+C

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integral of 4/(xsqrt(1+9x^2))

\int \frac{4}{x 1 + 9 x ^{2}} d x

- 4 (\frac{1}{2} ln 1 + 9 x^{2} + 1 - \frac{1}{2} ln 1 + 9 x^{2} - 1) + C

Solution steps

\int \frac{4}{x 1 + 9 x ^{2}} d x

Take the constant out:

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

= 4 \cdot \int \frac{1}{x 1 + 9 x ^{2}} d x

Apply u-substitution

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

Factor

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

= 4 \cdot \int \frac{1}{- ( - u ^{2} + 1 )} d u

Take the constant out:

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

= 4 (- \int \frac{1}{- u ^{2} + 1} d u)

Use the common integral:

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

= 4 (- (\frac{ln ∣ u + 1 ∣}{2} - \frac{ln ∣ u - 1 ∣}{2}))

Substitute back

u = 1 + 9 x^{2}

= 4 (- (\frac{ln 1 + 9 x ^{2} + 1}{2} - \frac{ln 1 + 9 x ^{2} - 1}{2}))

Simplify

4 (- (\frac{ln 1 + 9 x ^{2} + 1}{2} - \frac{ln 1 + 9 x ^{2} - 1}{2})) : - 4 (\frac{1}{2} ln 1 + 9 x^{2} + 1 - \frac{1}{2} ln 1 + 9 x^{2} - 1)

= - 4 (\frac{1}{2} ln 1 + 9 x^{2} + 1 - \frac{1}{2} ln 1 + 9 x^{2} - 1)

Add a constant to the solution

= - 4 (\frac{1}{2} ln 1 + 9 x^{2} + 1 - \frac{1}{2} ln 1 + 9 x^{2} - 1) + C

What is the integral of 4/(xsqrt(1+9x^2)) ?
The integral of 4/(xsqrt(1+9x^2)) is -4(1/2 ln|sqrt(1+9x^2)+1|-1/2 ln|sqrt(1+9x^2)-1|)+C