Sunday, November 13, 2011

Single Variable Calculus, Chapter 5, 5.4, Section 5.4, Problem 22

Find the integrals $\displaystyle \int^0_{-2} \left( u^5 - u^3 + u^2 \right) du$

$
\begin{equation}
\begin{aligned}
\int \left( u^5 - u^3 + u^2 \right) du &= \int u^5 du - \int u^3 du + \int u^2 du\\
\\
\int \left( u^5 - u^3 + u^2 \right) du &= \frac{u^{5+1}}{5+1} - \frac{u^{3+1}}{3+1} + \frac{u^{2+1}}{2+1} + C\\
\\
\int \left( u^5 - u^3 + u^2 \right) du &= \frac{u^6}{6} - \frac{u^4}{4} + \frac{u^3}{3} + C\\
\\
\int^0_{-2} \left( u^5 - u^3 + u^2 \right) du &= \frac{(0)^6}{6} - \frac{(0)^4}{4} + \frac{(0)^3}{3} + C - \left[ \frac{(-2)^6}{6} - \frac{(-2)^4}{4} + \frac{(-2)^3}{3} + C\right]\\
\\
\int^0_{-2} \left( u^5 - u^3 + u^2 \right) du &= C - \frac{64}{6} + \frac{16}{4} + \frac{8}{3} - C\\
\\
\int^0_{-2} \left( u^5 - u^3 + u^2 \right) du &= -4
\end{aligned}
\end{equation}
$

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