What is the integral from 0 to 7 of sqrt(49-x^2) ?

The integral from 0 to 7 of sqrt(49-x^2) is (49pi)/4

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integral from 0 to 7 of sqrt(49-x^2)

\int_{0}^{7} 49 - x^{2} d x

\frac{49 π}{4}

Decimal Notation

38.48451 \dots

Solution steps

\int_{0}^{7} 49 - x^{2} d x

Apply Trigonometric Substitution

: \int_{0}^{\frac{π}{2}} 49 cos^{2} (u) d u

= \int_{0}^{\frac{π}{2}} 49 cos^{2} (u) d u

Take the constant out:

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

= 49 \cdot \int_{0}^{\frac{π}{2}} cos^{2} (u) d u

Rewrite using trig identities

= 49 \cdot \int_{0}^{\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

= 49 \cdot \frac{1}{2} \cdot \int_{0}^{\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

= 49 \cdot \frac{1}{2} (\int_{0}^{\frac{π}{2}} 1 d u + \int_{0}^{\frac{π}{2}} cos (2 u) d u)

\int_{0}^{\frac{π}{2}} 1 d u = \frac{π}{2}

\int_{0}^{\frac{π}{2}} cos (2 u) d u = 0

= 49 \cdot \frac{1}{2} (\frac{π}{2} + 0)

Simplify

49 \cdot \frac{1}{2} (\frac{π}{2} + 0) : \frac{49 π}{4}

= \frac{49 π}{4}

\frac{\partial}{\partial x} ((x - 2) (1 - e^{- x}))

\frac{1}{4} y^{^{''}} + 4 t = 2 tan (4 t) - \frac{1}{3} e^{t}

x \to 0 lim (\frac{sec ( x ) - 1}{x})

\frac{d}{d x} (\frac{1}{4 x - 1})

\int \frac{sec ( 2 y ) tan ( 2 y )}{4 + sec ( 2 y )} d y

What is the integral from 0 to 7 of sqrt(49-x^2) ?
The integral from 0 to 7 of sqrt(49-x^2) is (49pi)/4