What is the integral of-7/((x^2+7)^{3/2)} ?

The integral of-7/((x^2+7)^{3/2)} is -x/((7+x^2)^{1/2)}+C

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integral of-7/((x^2+7)^{3/2)}

\int - \frac{7}{( x ^{2} + 7 ) ^{\frac{3}{2}}} d x

- \frac{x}{( 7 + x ^{2} ) ^{\frac{1}{2}}} + C

Solution steps

\int - \frac{7}{( x ^{2} + 7 ) ^{\frac{3}{2}}} d x

Take the constant out:

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

= - 7 \cdot \int \frac{1}{( x ^{2} + 7 ) ^{\frac{3}{2}}} d x

Apply Trigonometric Substitution

: \int \frac{1}{7 sec ( u )} d u

= - 7 \cdot \int \frac{1}{7 sec ( u )} d u

Take the constant out:

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

= - 7 \cdot \frac{1}{7} \cdot \int \frac{1}{sec ( u )} d u

Rewrite using trig identities

= - 7 \cdot \frac{1}{7} \cdot \int cos (u) d u

Use the common integral:

\int cos (u) d u = sin (u)

= - 7 \cdot \frac{1}{7} sin (u)

Substitute back

u = arctan (\frac{1}{7 ^{\frac{1}{2}}} x)

= - 7 \cdot \frac{1}{7} sin (arctan (\frac{1}{7 ^{\frac{1}{2}}} x))

Simplify

- 7 \cdot \frac{1}{7} sin (arctan (\frac{1}{7 ^{\frac{1}{2}}} x)) : - \frac{x}{( 7 + x ^{2} ) ^{\frac{1}{2}}}

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

Add a constant to the solution

= - \frac{x}{( 7 + x ^{2} ) ^{\frac{1}{2}}} + C

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What is the integral of-7/((x^2+7)^{3/2)} ?
The integral of-7/((x^2+7)^{3/2)} is -x/((7+x^2)^{1/2)}+C