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Identifying \(\displaystyle f=5 x + 6\) and \(\displaystyle g=\left(6 x + 1\right) \log{\left(x \right)}\) and using the product rule with \(\displaystyle f=5 x + 6 \implies f'=5\). This leaves g as \(\displaystyle g = \left(6 x + 1\right) \log{\left(x \right)}\) which also requires the product rule. Pushing down in the new product rule \(\displaystyle f=6 x + 1 \implies f'=6\) and \(\displaystyle g=\log{\left(x \right)} \implies g'=\frac{1}{x}\). Popping up a level gives \(\displaystyle g'=(\log{\left(x \right)})(6)+(6 x + 1)(\frac{1}{x})\)Popping up again (Back to the original problem) gives \(\displaystyle f'=(5 x + 6)(6 \log{\left(x \right)} + \frac{6 x + 1}{x})+(\left(6 x + 1\right) \log{\left(x \right)})(5)=\left(30 x + 5\right) \log{\left(x \right)} + \left(30 x + 36\right) \log{\left(x \right)} + \frac{\left(5 x + 6\right) \left(6 x + 1\right)}{x}\)

Download \(\LaTeX\)

\begin{question}Find the derivative of $y = (5 x + 6)(6 x + 1)(\log{\left(x \right)})$.
    \soln{9cm}{Identifying $f=5 x + 6$ and $g=\left(6 x + 1\right) \log{\left(x \right)}$ and using the product rule with $f=5 x + 6 \implies f'=5$. This leaves g as $g = \left(6 x + 1\right) \log{\left(x \right)}$ which also requires the product rule. Pushing down in the new product rule $f=6 x + 1 \implies f'=6$ and $g=\log{\left(x \right)} \implies g'=\frac{1}{x}$. Popping up a level gives $g'=(\log{\left(x \right)})(6)+(6 x + 1)(\frac{1}{x})$Popping up again (Back to the original problem) gives $f'=(5 x + 6)(6 \log{\left(x \right)} + \frac{6 x + 1}{x})+(\left(6 x + 1\right) \log{\left(x \right)})(5)=\left(30 x + 5\right) \log{\left(x \right)} + \left(30 x + 36\right) \log{\left(x \right)} + \frac{\left(5 x + 6\right) \left(6 x + 1\right)}{x}$}

\end{question}

Download Question and Solution Environment\(\LaTeX\)

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\begin{document}\begin{question}(10pts) The question goes here!
    \soln{9cm}{The solution goes here.}

\end{question}\end{document}

HTML for Canvas

<p> <p>Find the derivative of  <img class="equation_image" title=" \displaystyle y = (5 x + 6)(6 x + 1)(\log{\left(x \right)}) " src="/equation_images/%20%5Cdisplaystyle%20y%20%3D%20%285%20x%20%2B%206%29%286%20x%20%2B%201%29%28%5Clog%7B%5Cleft%28x%20%5Cright%29%7D%29%20" alt="LaTeX:  \displaystyle y = (5 x + 6)(6 x + 1)(\log{\left(x \right)}) " data-equation-content=" \displaystyle y = (5 x + 6)(6 x + 1)(\log{\left(x \right)}) " /> .</p> </p>

HTML for Canvas

<p> <p>Identifying  <img class="equation_image" title=" \displaystyle f=5 x + 6 " src="/equation_images/%20%5Cdisplaystyle%20f%3D5%20x%20%2B%206%20" alt="LaTeX:  \displaystyle f=5 x + 6 " data-equation-content=" \displaystyle f=5 x + 6 " />  and  <img class="equation_image" title=" \displaystyle g=\left(6 x + 1\right) \log{\left(x \right)} " src="/equation_images/%20%5Cdisplaystyle%20g%3D%5Cleft%286%20x%20%2B%201%5Cright%29%20%5Clog%7B%5Cleft%28x%20%5Cright%29%7D%20" alt="LaTeX:  \displaystyle g=\left(6 x + 1\right) \log{\left(x \right)} " data-equation-content=" \displaystyle g=\left(6 x + 1\right) \log{\left(x \right)} " />  and using the product rule with  <img class="equation_image" title=" \displaystyle f=5 x + 6 \implies f'=5 " src="/equation_images/%20%5Cdisplaystyle%20f%3D5%20x%20%2B%206%20%5Cimplies%20f%27%3D5%20" alt="LaTeX:  \displaystyle f=5 x + 6 \implies f'=5 " data-equation-content=" \displaystyle f=5 x + 6 \implies f'=5 " /> . This leaves g as  <img class="equation_image" title=" \displaystyle g = \left(6 x + 1\right) \log{\left(x \right)} " src="/equation_images/%20%5Cdisplaystyle%20g%20%3D%20%5Cleft%286%20x%20%2B%201%5Cright%29%20%5Clog%7B%5Cleft%28x%20%5Cright%29%7D%20" alt="LaTeX:  \displaystyle g = \left(6 x + 1\right) \log{\left(x \right)} " data-equation-content=" \displaystyle g = \left(6 x + 1\right) \log{\left(x \right)} " />  which also requires the product rule. Pushing down in the new product rule  <img class="equation_image" title=" \displaystyle f=6 x + 1 \implies f'=6 " src="/equation_images/%20%5Cdisplaystyle%20f%3D6%20x%20%2B%201%20%5Cimplies%20f%27%3D6%20" alt="LaTeX:  \displaystyle f=6 x + 1 \implies f'=6 " data-equation-content=" \displaystyle f=6 x + 1 \implies f'=6 " />  and  <img class="equation_image" title=" \displaystyle g=\log{\left(x \right)} \implies g'=\frac{1}{x} " src="/equation_images/%20%5Cdisplaystyle%20g%3D%5Clog%7B%5Cleft%28x%20%5Cright%29%7D%20%5Cimplies%20g%27%3D%5Cfrac%7B1%7D%7Bx%7D%20" alt="LaTeX:  \displaystyle g=\log{\left(x \right)} \implies g'=\frac{1}{x} " data-equation-content=" \displaystyle g=\log{\left(x \right)} \implies g'=\frac{1}{x} " /> . Popping up a level gives  <img class="equation_image" title=" \displaystyle g'=(\log{\left(x \right)})(6)+(6 x + 1)(\frac{1}{x}) " src="/equation_images/%20%5Cdisplaystyle%20g%27%3D%28%5Clog%7B%5Cleft%28x%20%5Cright%29%7D%29%286%29%2B%286%20x%20%2B%201%29%28%5Cfrac%7B1%7D%7Bx%7D%29%20" alt="LaTeX:  \displaystyle g'=(\log{\left(x \right)})(6)+(6 x + 1)(\frac{1}{x}) " data-equation-content=" \displaystyle g'=(\log{\left(x \right)})(6)+(6 x + 1)(\frac{1}{x}) " /> Popping up again (Back to the original problem) gives  <img class="equation_image" title=" \displaystyle f'=(5 x + 6)(6 \log{\left(x \right)} + \frac{6 x + 1}{x})+(\left(6 x + 1\right) \log{\left(x \right)})(5)=\left(30 x + 5\right) \log{\left(x \right)} + \left(30 x + 36\right) \log{\left(x \right)} + \frac{\left(5 x + 6\right) \left(6 x + 1\right)}{x} " src="/equation_images/%20%5Cdisplaystyle%20f%27%3D%285%20x%20%2B%206%29%286%20%5Clog%7B%5Cleft%28x%20%5Cright%29%7D%20%2B%20%5Cfrac%7B6%20x%20%2B%201%7D%7Bx%7D%29%2B%28%5Cleft%286%20x%20%2B%201%5Cright%29%20%5Clog%7B%5Cleft%28x%20%5Cright%29%7D%29%285%29%3D%5Cleft%2830%20x%20%2B%205%5Cright%29%20%5Clog%7B%5Cleft%28x%20%5Cright%29%7D%20%2B%20%5Cleft%2830%20x%20%2B%2036%5Cright%29%20%5Clog%7B%5Cleft%28x%20%5Cright%29%7D%20%2B%20%5Cfrac%7B%5Cleft%285%20x%20%2B%206%5Cright%29%20%5Cleft%286%20x%20%2B%201%5Cright%29%7D%7Bx%7D%20" alt="LaTeX:  \displaystyle f'=(5 x + 6)(6 \log{\left(x \right)} + \frac{6 x + 1}{x})+(\left(6 x + 1\right) \log{\left(x \right)})(5)=\left(30 x + 5\right) \log{\left(x \right)} + \left(30 x + 36\right) \log{\left(x \right)} + \frac{\left(5 x + 6\right) \left(6 x + 1\right)}{x} " data-equation-content=" \displaystyle f'=(5 x + 6)(6 \log{\left(x \right)} + \frac{6 x + 1}{x})+(\left(6 x + 1\right) \log{\left(x \right)})(5)=\left(30 x + 5\right) \log{\left(x \right)} + \left(30 x + 36\right) \log{\left(x \right)} + \frac{\left(5 x + 6\right) \left(6 x + 1\right)}{x} " /> </p> </p>