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Use 4 rectangles to approximate \(\displaystyle \int\limits_{3}^{6} \frac{12}{x^{2}}\, dx\) using the right endpoint. Draw a graph showing the sum.
\(\displaystyle \Delta x = \frac{b-a}{n}=\frac{3}{4}\) and \(\displaystyle x_i = a+i\Delta x = \frac{3 i}{4} + 3\). Drawing a graph gives:
\begin{tikzpicture}[yscale=2]
\draw[very thick, color=blue, opacity=0.3, xstep=1, ystep=1] (-1,-1) grid (7,2.10000000000000);
\draw[latex-latex, very thick] (-1.4,0)--(7.4,0) node[right]{$x$};
\draw[latex-latex, very thick] (0,-1.1)--(0,2.2) node[above]{$y$};
\foreach \x in { -1,1,...,7 }{
\pgfmathsetmacro{\xtick}{\x != 0 ? "\x" : ""}
\draw (\x, .2) -- (\x,-.2) node[below]{$\xtick$};
}
\foreach \y in { -1,-0.5,...,2.10000000000000 }{
\pgfmathsetmacro{\ytick}{\y != 0 ? "\y" : ""}
\draw (.2, \y) -- (-.2, \y) node[left]{$\ytick$};
}
\draw[thick, color=blue, domain={3.0}:{6.0}, samples=200, samples =350] plot(\x, {12/(\x)^2});
\draw[fill=blue, opacity=0.3](3.00, 0) rectangle (3.75, 0.853);
\draw[thick](3.00, 0) rectangle (3.75, 0.853);
\draw[fill=blue, opacity=0.3](3.75, 0) rectangle (4.50, 0.593);
\draw[thick](3.75, 0) rectangle (4.50, 0.593);
\draw[fill=blue, opacity=0.3](4.50, 0) rectangle (5.25, 0.435);
\draw[thick](4.50, 0) rectangle (5.25, 0.435);
\draw[fill=blue, opacity=0.3](5.25, 0) rectangle (6.00, 0.333);
\draw[thick](5.25, 0) rectangle (6.00, 0.333);
\end{tikzpicture}
\begin{question}Use 4 rectangles to approximate $\int\limits_{3}^{6} \frac{12}{x^{2}}\, dx$ using the right endpoint. Draw a graph showing the sum.
\soln{9cm}{$\Delta x = \frac{b-a}{n}=\frac{3}{4}$ and $x_i = a+i\Delta x = \frac{3 i}{4} + 3$. Drawing a graph gives:
\begin{center}\begin{tikzpicture}[yscale=2]
\draw[very thick, color=blue, opacity=0.3, xstep=1, ystep=1] (-1,-1) grid (7,2.10000000000000);
\draw[latex-latex, very thick] (-1.4,0)--(7.4,0) node[right]{$x$};
\draw[latex-latex, very thick] (0,-1.1)--(0,2.2) node[above]{$y$};
\foreach \x in { -1,1,...,7 }{
\pgfmathsetmacro{\xtick}{\x != 0 ? "\x" : ""}
\draw (\x, .2) -- (\x,-.2) node[below]{$\xtick$};
}
\foreach \y in { -1,-0.5,...,2.10000000000000 }{
\pgfmathsetmacro{\ytick}{\y != 0 ? "\y" : ""}
\draw (.2, \y) -- (-.2, \y) node[left]{$\ytick$};
}
\draw[thick, color=blue, domain={3.0}:{6.0}, samples=200, samples =350] plot(\x, {12/(\x)^2});
\draw[fill=blue, opacity=0.3](3.00, 0) rectangle (3.75, 0.853);
\draw[thick](3.00, 0) rectangle (3.75, 0.853);
\draw[fill=blue, opacity=0.3](3.75, 0) rectangle (4.50, 0.593);
\draw[thick](3.75, 0) rectangle (4.50, 0.593);
\draw[fill=blue, opacity=0.3](4.50, 0) rectangle (5.25, 0.435);
\draw[thick](4.50, 0) rectangle (5.25, 0.435);
\draw[fill=blue, opacity=0.3](5.25, 0) rectangle (6.00, 0.333);
\draw[thick](5.25, 0) rectangle (6.00, 0.333);
\end{tikzpicture}
\end{center}
The sum is $\sum_{i=1}^{4} \frac{9}{\left(\frac{3 i}{4} + 3\right)^{2}} = 1.6610$. }
\end{question}
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\begin{document}\begin{question}(10pts) The question goes here!
\soln{9cm}{The solution goes here.}
\end{question}\end{document}<p> <p>Use 4 rectangles to approximate <img class="equation_image" title=" \displaystyle \int\limits_{3}^{6} \frac{12}{x^{2}}\, dx " src="/equation_images/%20%5Cdisplaystyle%20%5Cint%5Climits_%7B3%7D%5E%7B6%7D%20%5Cfrac%7B12%7D%7Bx%5E%7B2%7D%7D%5C%2C%20dx%20" alt="LaTeX: \displaystyle \int\limits_{3}^{6} \frac{12}{x^{2}}\, dx " data-equation-content=" \displaystyle \int\limits_{3}^{6} \frac{12}{x^{2}}\, dx " /> using the right endpoint. Draw a graph showing the sum. </p> </p><p> <p> <img class="equation_image" title=" \displaystyle \Delta x = \frac{b-a}{n}=\frac{3}{4} " src="/equation_images/%20%5Cdisplaystyle%20%5CDelta%20x%20%3D%20%5Cfrac%7Bb-a%7D%7Bn%7D%3D%5Cfrac%7B3%7D%7B4%7D%20" alt="LaTeX: \displaystyle \Delta x = \frac{b-a}{n}=\frac{3}{4} " data-equation-content=" \displaystyle \Delta x = \frac{b-a}{n}=\frac{3}{4} " /> and <img class="equation_image" title=" \displaystyle x_i = a+i\Delta x = \frac{3 i}{4} + 3 " src="/equation_images/%20%5Cdisplaystyle%20x_i%20%3D%20a%2Bi%5CDelta%20x%20%3D%20%5Cfrac%7B3%20i%7D%7B4%7D%20%2B%203%20" alt="LaTeX: \displaystyle x_i = a+i\Delta x = \frac{3 i}{4} + 3 " data-equation-content=" \displaystyle x_i = a+i\Delta x = \frac{3 i}{4} + 3 " /> . Drawing a graph gives:
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The sum is <img class="equation_image" title=" \displaystyle \sum_{i=1}^{4} \frac{9}{\left(\frac{3 i}{4} + 3\right)^{2}} = 1.6610 " src="/equation_images/%20%5Cdisplaystyle%20%5Csum_%7Bi%3D1%7D%5E%7B4%7D%20%5Cfrac%7B9%7D%7B%5Cleft%28%5Cfrac%7B3%20i%7D%7B4%7D%20%2B%203%5Cright%29%5E%7B2%7D%7D%20%3D%201.6610%20" alt="LaTeX: \displaystyle \sum_{i=1}^{4} \frac{9}{\left(\frac{3 i}{4} + 3\right)^{2}} = 1.6610 " data-equation-content=" \displaystyle \sum_{i=1}^{4} \frac{9}{\left(\frac{3 i}{4} + 3\right)^{2}} = 1.6610 " /> . </p> </p>