assignment submission\nfor this assignment, you submit answers by question parts. the\nassignment…

assignment submission\nfor this assignment, you submit answers by question parts. the\nassignment scoring\nyour best submission for each question part is used for your score\n5. -/2.08 points\nevaluate the integral.\n int_{0}^{1}\frac{x - 8}{x^{2}-7x + 10}dx
Answer
Explanation:
Step1: Factor the denominator
First, factor $x^{2}-7x + 10=(x - 2)(x - 5)$. Then, use partial - fraction decomposition. Let $\frac{x - 8}{x^{2}-7x + 10}=\frac{x - 8}{(x - 2)(x - 5)}=\frac{A}{x - 2}+\frac{B}{x - 5}$. Cross - multiply: $x - 8=A(x - 5)+B(x - 2)$. Set $x = 2$: $2-8=A(2 - 5)+B(2 - 2)$, so $-6=-3A$, and $A = 2$. Set $x = 5$: $5-8=A(5 - 5)+B(5 - 2)$, so $-3 = 3B$, and $B=-1$. Then $\frac{x - 8}{x^{2}-7x + 10}=\frac{2}{x - 2}-\frac{1}{x - 5}$.
Step2: Integrate term - by - term
$\int_{0}^{1}\frac{x - 8}{x^{2}-7x + 10}dx=\int_{0}^{1}(\frac{2}{x - 2}-\frac{1}{x - 5})dx$. Using the integral formula $\int\frac{1}{u}du=\ln|u|+C$, we have $\int_{0}^{1}(\frac{2}{x - 2}-\frac{1}{x - 5})dx=2\int_{0}^{1}\frac{1}{x - 2}dx-\int_{0}^{1}\frac{1}{x - 5}dx$. $2\int_{0}^{1}\frac{1}{x - 2}dx=2[\ln|x - 2|]{0}^{1}=2(\ln|1 - 2|-\ln|0 - 2|)=2(\ln1-\ln2)=-2\ln2$. $-\int{0}^{1}\frac{1}{x - 5}dx=-[\ln|x - 5|]_{0}^{1}=-(\ln|1 - 5|-\ln|0 - 5|)=-(\ln4-\ln5)=\ln5-\ln4$.
Step3: Combine the results
$-2\ln2+\ln5-\ln4=-2\ln2+\ln5 - 2\ln2=\ln5-4\ln2=\ln5-\ln16=\ln\frac{5}{16}$.
Answer:
$\ln\frac{5}{16}$