What is the integral of 1/(4x^2-11x+2) ?

The integral of 1/(4x^2-11x+2) is -1/(sqrt(89))(ln|(8x-11)/(sqrt(89))+1|-ln|(8x-11)/(sqrt(89))-1|)+C

English

Español

Português

Français

Deutsch

Italiano

Русский

中文(简体)

한국어

日本語

Tiếng Việt

עברית

العربية

integral of 1/(4x^2-11x+2)

\int \frac{1}{4 x ^{2} - 11 x + 2} d x

- \frac{1}{89} (ln \frac{8 x - 11}{89} + 1 - ln \frac{8 x - 11}{89} - 1) + C

Solution steps

\int \frac{1}{4 x ^{2} - 11 x + 2} d x

Factor

4 x^{2} - 11 x + 2 : - (- 4 x^{2} + 11 x - 2)

= \int \frac{1}{- ( - 4 x ^{2} + 11 x - 2 )} d x

Take the constant out:

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

= - \int \frac{1}{- 4 x ^{2} + 11 x - 2} d x

Complete the square

- 4 x^{2} + 11 x - 2 : - 4 (x - \frac{11}{8})^{2} + \frac{89}{16}

= - \int \frac{1}{- 4 ( x - \frac{11}{8} ) ^{2} + \frac{89}{16}} d x

Apply u-substitution

= - \int \frac{16}{- 64 u ^{2} + 89} d u

Take the constant out:

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

= - 16 \cdot \int \frac{1}{- 64 u ^{2} + 89} d u

Apply Integral Substitution

= - 16 \cdot \int \frac{1}{8 89 ( - v ^{2} + 1 )} d v

Take the constant out:

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

= - 16 \cdot \frac{1}{8 89} \cdot \int \frac{1}{- v ^{2} + 1} d v

Use the common integral:

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

= - 16 \cdot \frac{1}{8 89} (\frac{ln ∣ v + 1 ∣}{2} - \frac{ln ∣ v - 1 ∣}{2})

Substitute back

= - 16 \cdot \frac{1}{8 89} \frac{ln \frac{8}{89} ( x - \frac{11}{8} ) + 1}{2} - \frac{ln \frac{8}{89} ( x - \frac{11}{8} ) - 1}{2}

Simplify

- 16 \cdot \frac{1}{8 89} \frac{ln \frac{8}{89} ( x - \frac{11}{8} ) + 1}{2} - \frac{ln \frac{8}{89} ( x - \frac{11}{8} ) - 1}{2} : - \frac{1}{89} (ln \frac{8 x - 11}{89} + 1 - ln \frac{8 x - 11}{89} - 1)

= - \frac{1}{89} (ln \frac{8 x - 11}{89} + 1 - ln \frac{8 x - 11}{89} - 1)

Add a constant to the solution

= - \frac{1}{89} (ln \frac{8 x - 11}{89} + 1 - ln \frac{8 x - 11}{89} - 1) + C

What is the integral of 1/(4x^2-11x+2) ?
The integral of 1/(4x^2-11x+2) is -1/(sqrt(89))(ln|(8x-11)/(sqrt(89))+1|-ln|(8x-11)/(sqrt(89))-1|)+C