What is the integral of 5/(sqrt(x^2+16)) ?

The integral of 5/(sqrt(x^2+16)) is 5ln(1/4 |x+sqrt(16+x^2)|)+C

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integral of 5/(sqrt(x^2+16))

\int \frac{5}{x ^{2} + 16} d x

5 ln (\frac{1}{4} x + 16 + x^{2}) + C

Solution steps

\int \frac{5}{x ^{2} + 16} d x

Take the constant out:

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

= 5 \cdot \int \frac{1}{x ^{2} + 16} d x

Apply Trigonometric Substitution

= 5 \cdot \int sec (u) d u

Use the common integral:

\int sec (u) d u = ln ∣ tan (u) + sec (u) ∣

= 5 ln ∣ tan (u) + sec (u) ∣

Substitute back

u = arctan (\frac{1}{4} x)

= 5 ln tan (arctan (\frac{1}{4} x)) + sec (arctan (\frac{1}{4} x))

Simplify

5 ln tan (arctan (\frac{1}{4} x)) + sec (arctan (\frac{1}{4} x)) : 5 ln (\frac{1}{4} x + 16 + x^{2})

= 5 ln (\frac{1}{4} x + 16 + x^{2})

Add a constant to the solution

= 5 ln (\frac{1}{4} x + 16 + x^{2}) + C

What is the integral of 5/(sqrt(x^2+16)) ?
The integral of 5/(sqrt(x^2+16)) is 5ln(1/4 |x+sqrt(16+x^2)|)+C