What is the integral of 1/(7x^2-14x+28) ?

The integral of 1/(7x^2-14x+28) is 1/(7sqrt(3))arctan(1/(sqrt(3))(x-1))+C

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integral of 1/(7x^2-14x+28)

\int \frac{1}{7 x ^{2} - 14 x + 28} d x

\frac{1}{7 3} arctan (\frac{1}{3} (x - 1)) + C

Solution steps

\int \frac{1}{7 x ^{2} - 14 x + 28} d x

Complete the square

7 x^{2} - 14 x + 28 : 7 (x - 1)^{2} + 21

= \int \frac{1}{7 ( x - 1 ) ^{2} + 21} d x

Apply u-substitution

= \int \frac{1}{7 u ^{2} + 21} d u

Apply Integral Substitution

= \int \frac{1}{7 3 ( 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}{7 3} \cdot \int \frac{1}{v ^{2} + 1} d v

Use the common integral:

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

= \frac{1}{7 3} arctan (v)

Substitute back

= \frac{1}{7 3} arctan (\frac{7}{21} (x - 1))

Simplify

\frac{1}{7 3} arctan (\frac{7}{21} (x - 1)) : \frac{1}{7 3} arctan (\frac{1}{3} (x - 1))

= \frac{1}{7 3} arctan (\frac{1}{3} (x - 1))

Add a constant to the solution

= \frac{1}{7 3} arctan (\frac{1}{3} (x - 1)) + C

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What is the integral of 1/(7x^2-14x+28) ?
The integral of 1/(7x^2-14x+28) is 1/(7sqrt(3))arctan(1/(sqrt(3))(x-1))+C