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Calculus
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Evaluate the limit \(\displaystyle \lim_{x \to 4}\frac{3 x^{2} - 30 x + 72}{x^{2} - 9 x + 20}\)

The limit is an indeterminate form of the type \(\displaystyle \frac{0}{0}\). Using L'Hospitial's rule and then the evaluation theorem gives: \begin{equation*} \lim_{x \to 4}\frac{3 x^{2} - 30 x + 72}{x^{2} - 9 x + 20} = \lim_{x \to 4}\frac{6 x - 30}{2 x - 9} = \frac{6 (4) - 30}{2 (4) - 9} = 6 \end{equation*}

Download \(\LaTeX\) 

\begin{question}Evaluate the limit $\lim_{x \to 4}\frac{3 x^{2} - 30 x + 72}{x^{2} - 9 x + 20}$
    \soln{9cm}{The limit is an indeterminate form of the type $\frac{0}{0}$. Using L'Hospitial's rule and then the evaluation theorem gives: \begin{equation*} \lim_{x \to 4}\frac{3 x^{2} - 30 x + 72}{x^{2} - 9 x + 20} = \lim_{x \to 4}\frac{6 x - 30}{2 x - 9} = \frac{6 (4) - 30}{2 (4) - 9} = 6 \end{equation*}}

\end{question}

Download Question and Solution Environment\(\LaTeX\)
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HTML for Canvas 
<p> <p>Evaluate the limit  <img class="equation_image" title=" \displaystyle \lim_{x \to 4}\frac{3 x^{2} - 30 x + 72}{x^{2} - 9 x + 20} " src="/equation_images/%20%5Cdisplaystyle%20%5Clim_%7Bx%20%5Cto%204%7D%5Cfrac%7B3%20x%5E%7B2%7D%20-%2030%20x%20%2B%2072%7D%7Bx%5E%7B2%7D%20-%209%20x%20%2B%2020%7D%20" alt="LaTeX:  \displaystyle \lim_{x \to 4}\frac{3 x^{2} - 30 x + 72}{x^{2} - 9 x + 20} " data-equation-content=" \displaystyle \lim_{x \to 4}\frac{3 x^{2} - 30 x + 72}{x^{2} - 9 x + 20} " /> </p> </p>
HTML for Canvas
<p> <p>The limit is an indeterminate form of the type  <img class="equation_image" title=" \displaystyle \frac{0}{0} " src="/equation_images/%20%5Cdisplaystyle%20%5Cfrac%7B0%7D%7B0%7D%20" alt="LaTeX:  \displaystyle \frac{0}{0} " data-equation-content=" \displaystyle \frac{0}{0} " /> . Using L'Hospitial's rule and then the evaluation theorem gives:  <img class="equation_image" title="  \lim_{x \to 4}\frac{3 x^{2} - 30 x + 72}{x^{2} - 9 x + 20} = \lim_{x \to 4}\frac{6 x - 30}{2 x - 9} = \frac{6 (4) - 30}{2 (4) - 9} = 6  " src="/equation_images/%20%20%5Clim_%7Bx%20%5Cto%204%7D%5Cfrac%7B3%20x%5E%7B2%7D%20-%2030%20x%20%2B%2072%7D%7Bx%5E%7B2%7D%20-%209%20x%20%2B%2020%7D%20%3D%20%5Clim_%7Bx%20%5Cto%204%7D%5Cfrac%7B6%20x%20-%2030%7D%7B2%20x%20-%209%7D%20%3D%20%5Cfrac%7B6%20%284%29%20-%2030%7D%7B2%20%284%29%20-%209%7D%20%3D%206%20%20" alt="LaTeX:   \lim_{x \to 4}\frac{3 x^{2} - 30 x + 72}{x^{2} - 9 x + 20} = \lim_{x \to 4}\frac{6 x - 30}{2 x - 9} = \frac{6 (4) - 30}{2 (4) - 9} = 6  " data-equation-content="  \lim_{x \to 4}\frac{3 x^{2} - 30 x + 72}{x^{2} - 9 x + 20} = \lim_{x \to 4}\frac{6 x - 30}{2 x - 9} = \frac{6 (4) - 30}{2 (4) - 9} = 6  " /> </p> </p>