What is the integral of 2/(sqrt(5-4x-x^2)) ?

The integral of 2/(sqrt(5-4x-x^2)) is 2arcsin(1/3 (x+2))+C

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integral of 2/(sqrt(5-4x-x^2))

\int \frac{2}{5 - 4 x - x ^{2}} d x

2 arcsin (\frac{1}{3} (x + 2)) + C

Solution steps

\int \frac{2}{5 - 4 x - x ^{2}} d x

Take the constant out:

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

= 2 \cdot \int \frac{1}{5 - 4 x - x ^{2}} d x

Complete the square

5 - 4 x - x^{2} : - (x + 2)^{2} + 9

= 2 \cdot \int \frac{1}{- ( x + 2 ) ^{2} + 9} d x

Apply u-substitution

= 2 \cdot \int \frac{1}{- u ^{2} + 9} d u

Apply Trigonometric Substitution

= 2 \cdot \int 1 d v

Integral of a constant:

\int a d x = a x

= 2 \cdot 1 \cdot v

Substitute back

= 2 \cdot 1 \cdot arcsin (\frac{1}{3} (x + 2))

Simplify

= 2 arcsin (\frac{1}{3} (x + 2))

Add a constant to the solution

= 2 arcsin (\frac{1}{3} (x + 2)) + C

What is the integral of 2/(sqrt(5-4x-x^2)) ?
The integral of 2/(sqrt(5-4x-x^2)) is 2arcsin(1/3 (x+2))+C