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

Lösung

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

\frac{49 ( 2 + ln ( 1 + 2 ) )}{2}

Dezimale

56.24188 \dots

Schritte zur Lösung

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

Trigonometrische Substitution anwenden

= \int_{0}^{\frac{π}{4}} 49 sec^{3} (u) d u

Entferne die Konstante:

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

= 49 \cdot \int_{0}^{\frac{π}{4}} sec^{3} (u) d u

Wende integrale Reduktion an

= 49 ([\frac{sec ^{2} ( u ) sin ( u )}{2}]_{0}^{\frac{π}{4}} + \frac{1}{2} \cdot \int_{0}^{\frac{π}{4}} sec (u) d u)

\int_{0}^{\frac{π}{4}} sec (u) d u = ln (1 + 2)

= 49 ([\frac{sec ^{2} ( u ) sin ( u )}{2}]_{0}^{\frac{π}{4}} + \frac{1}{2} ln (1 + 2))

Vereinfache

49 ([\frac{sec ^{2} ( u ) sin ( u )}{2}]_{0}^{\frac{π}{4}} + \frac{1}{2} ln (1 + 2)) : 49 ([\frac{1}{2} sec (u) tan (u)]_{0}^{\frac{π}{4}} + \frac{1}{2} ln (1 + 2))

= 49 ([\frac{1}{2} sec (u) tan (u)]_{0}^{\frac{π}{4}} + \frac{1}{2} ln (1 + 2))

Berechne die Grenzen:

\frac{1}{2}

= 49 (\frac{1}{2} + \frac{1}{2} ln (1 + 2))

Vereinfache

= \frac{49 ( 2 + ln ( 1 + 2 ) )}{2}

\int (\frac{2}{x} + \frac{x}{2}) d x

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