What is the integral from 4 to 8 of sqrt(64-x^2) ?

The integral from 4 to 8 of sqrt(64-x^2) is 32(pi/3-(sqrt(3))/4)

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integral from 4 to 8 of sqrt(64-x^2)

\int_{4}^{8} 64 - x^{2} d x

32 (\frac{π}{3} - \frac{3}{4})

Decimal

19.65391 \dots

Solution steps

\int_{4}^{8} 64 - x^{2} d x

Apply Trigonometric Substitution

: \int_{\frac{π}{6}}^{\frac{π}{2}} 64 cos^{2} (u) d u

= \int_{\frac{π}{6}}^{\frac{π}{2}} 64 cos^{2} (u) d u

Take the constant out:

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

= 64 \cdot \int_{\frac{π}{6}}^{\frac{π}{2}} cos^{2} (u) d u

Rewrite using trig identities

= 64 \cdot \int_{\frac{π}{6}}^{\frac{π}{2}} \frac{1 + cos ( 2 u )}{2} d u

Take the constant out:

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

= 64 \cdot \frac{1}{2} \cdot \int_{\frac{π}{6}}^{\frac{π}{2}} 1 + cos (2 u) d u

Apply the Sum Rule:

\int f (x) \pm g (x) d x = \int f (x) d x \pm \int g (x) d x

= 64 \cdot \frac{1}{2} (\int_{\frac{π}{6}}^{\frac{π}{2}} 1 d u + \int_{\frac{π}{6}}^{\frac{π}{2}} cos (2 u) d u)

\int_{\frac{π}{6}}^{\frac{π}{2}} 1 d u = \frac{π}{3}

\int_{\frac{π}{6}}^{\frac{π}{2}} cos (2 u) d u = - \frac{3}{4}

= 64 \cdot \frac{1}{2} (\frac{π}{3} - \frac{3}{4})

Simplify

64 \cdot \frac{1}{2} (\frac{π}{3} - \frac{3}{4}) : 32 (\frac{π}{3} - \frac{3}{4})

= 32 (\frac{π}{3} - \frac{3}{4})

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What is the integral from 4 to 8 of sqrt(64-x^2) ?
The integral from 4 to 8 of sqrt(64-x^2) is 32(pi/3-(sqrt(3))/4)