What is the integral of (21x+1)/((21x^2+2x)^3) ?

The integral of (21x+1)/((21x^2+2x)^3) is -1/(4(21x^2+2x)^2)+C

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integral of (21x+1)/((21x^2+2x)^3)

\int \frac{21 x + 1}{( 21 x ^{2} + 2 x ) ^{3}} d x

- \frac{1}{4 ( 21 x ^{2} + 2 x ) ^{2}} + C

Solution steps

\int \frac{21 x + 1}{( 21 x ^{2} + 2 x ) ^{3}} d x

Apply u-substitution

: \int \frac{1}{2 u ^{3}} d u

= \int \frac{1}{2 u ^{3}} 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}{u ^{3}} d u

Apply the Power Rule

: - \frac{1}{2 u ^{2}}

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

Substitute back

u = 21 x^{2} + 2 x

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

Simplify

\frac{1}{2} (- \frac{1}{2 ( 21 x ^{2} + 2 x ) ^{2}}) : - \frac{1}{4 ( 21 x ^{2} + 2 x ) ^{2}}

= - \frac{1}{4 ( 21 x ^{2} + 2 x ) ^{2}}

Add a constant to the solution

= - \frac{1}{4 ( 21 x ^{2} + 2 x ) ^{2}} + C

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What is the integral of (21x+1)/((21x^2+2x)^3) ?
The integral of (21x+1)/((21x^2+2x)^3) is -1/(4(21x^2+2x)^2)+C