What is the integral of sqrt(4-9x) ?

The integral of sqrt(4-9x) is -2/27 (4-9x)^{3/2}+C

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integral of sqrt(4-9x)

\int 4 - 9 x d x

- \frac{2}{27} (4 - 9 x)^{\frac{3}{2}} + C

Solution steps

\int 4 - 9 x d x

Apply u-substitution

: \int - \frac{u}{9} d u

= \int - \frac{u}{9} d u

Take the constant out:

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

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

Apply the Power Rule

: \frac{2}{3} u^{\frac{3}{2}}

= - \frac{1}{9} \cdot \frac{2}{3} u^{\frac{3}{2}}

Substitute back

u = 4 - 9 x

= - \frac{1}{9} \cdot \frac{2}{3} (4 - 9 x)^{\frac{3}{2}}

Simplify

- \frac{1}{9} \cdot \frac{2}{3} (4 - 9 x)^{\frac{3}{2}} : - \frac{2}{27} (4 - 9 x)^{\frac{3}{2}}

= - \frac{2}{27} (4 - 9 x)^{\frac{3}{2}}

Add a constant to the solution

= - \frac{2}{27} (4 - 9 x)^{\frac{3}{2}} + C

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What is the integral of sqrt(4-9x) ?
The integral of sqrt(4-9x) is -2/27 (4-9x)^{3/2}+C