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Find the derivative of \(\displaystyle y = (- 9 x - 7)(6 - 6 x)(4 - 6 x)\).
Identifying \(\displaystyle f=- 9 x - 7\) and \(\displaystyle g=\left(4 - 6 x\right) \left(6 - 6 x\right)\) and using the product rule with \(\displaystyle f=- 9 x - 7 \implies f'=-9\). This leaves g as \(\displaystyle g = \left(4 - 6 x\right) \left(6 - 6 x\right)\) which also requires the product rule. Pushing down in the new product rule \(\displaystyle f=6 - 6 x \implies f'=-6\) and \(\displaystyle g=4 - 6 x \implies g'=-6\). Popping up a level gives \(\displaystyle g'=(4 - 6 x)(-6)+(6 - 6 x)(-6)\)Popping up again (Back to the original problem) gives \(\displaystyle f'=(- 9 x - 7)(72 x - 60)+(\left(4 - 6 x\right) \left(6 - 6 x\right))(-9)=- 6 \left(4 - 6 x\right) \left(- 9 x - 7\right) + \left(6 - 6 x\right) \left(54 x - 36\right) + \left(6 - 6 x\right) \left(54 x + 42\right)\)
\begin{question}Find the derivative of $y = (- 9 x - 7)(6 - 6 x)(4 - 6 x)$.
\soln{9cm}{Identifying $f=- 9 x - 7$ and $g=\left(4 - 6 x\right) \left(6 - 6 x\right)$ and using the product rule with $f=- 9 x - 7 \implies f'=-9$. This leaves g as $g = \left(4 - 6 x\right) \left(6 - 6 x\right)$ which also requires the product rule. Pushing down in the new product rule $f=6 - 6 x \implies f'=-6$ and $g=4 - 6 x \implies g'=-6$. Popping up a level gives $g'=(4 - 6 x)(-6)+(6 - 6 x)(-6)$Popping up again (Back to the original problem) gives $f'=(- 9 x - 7)(72 x - 60)+(\left(4 - 6 x\right) \left(6 - 6 x\right))(-9)=- 6 \left(4 - 6 x\right) \left(- 9 x - 7\right) + \left(6 - 6 x\right) \left(54 x - 36\right) + \left(6 - 6 x\right) \left(54 x + 42\right)$}
\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>Find the derivative of <img class="equation_image" title=" \displaystyle y = (- 9 x - 7)(6 - 6 x)(4 - 6 x) " src="/equation_images/%20%5Cdisplaystyle%20y%20%3D%20%28-%209%20x%20-%207%29%286%20-%206%20x%29%284%20-%206%20x%29%20" alt="LaTeX: \displaystyle y = (- 9 x - 7)(6 - 6 x)(4 - 6 x) " data-equation-content=" \displaystyle y = (- 9 x - 7)(6 - 6 x)(4 - 6 x) " /> .</p> </p>
<p> <p>Identifying <img class="equation_image" title=" \displaystyle f=- 9 x - 7 " src="/equation_images/%20%5Cdisplaystyle%20f%3D-%209%20x%20-%207%20" alt="LaTeX: \displaystyle f=- 9 x - 7 " data-equation-content=" \displaystyle f=- 9 x - 7 " /> and <img class="equation_image" title=" \displaystyle g=\left(4 - 6 x\right) \left(6 - 6 x\right) " src="/equation_images/%20%5Cdisplaystyle%20g%3D%5Cleft%284%20-%206%20x%5Cright%29%20%5Cleft%286%20-%206%20x%5Cright%29%20" alt="LaTeX: \displaystyle g=\left(4 - 6 x\right) \left(6 - 6 x\right) " data-equation-content=" \displaystyle g=\left(4 - 6 x\right) \left(6 - 6 x\right) " /> and using the product rule with <img class="equation_image" title=" \displaystyle f=- 9 x - 7 \implies f'=-9 " src="/equation_images/%20%5Cdisplaystyle%20f%3D-%209%20x%20-%207%20%5Cimplies%20f%27%3D-9%20" alt="LaTeX: \displaystyle f=- 9 x - 7 \implies f'=-9 " data-equation-content=" \displaystyle f=- 9 x - 7 \implies f'=-9 " /> . This leaves g as <img class="equation_image" title=" \displaystyle g = \left(4 - 6 x\right) \left(6 - 6 x\right) " src="/equation_images/%20%5Cdisplaystyle%20g%20%3D%20%5Cleft%284%20-%206%20x%5Cright%29%20%5Cleft%286%20-%206%20x%5Cright%29%20" alt="LaTeX: \displaystyle g = \left(4 - 6 x\right) \left(6 - 6 x\right) " data-equation-content=" \displaystyle g = \left(4 - 6 x\right) \left(6 - 6 x\right) " /> which also requires the product rule. Pushing down in the new product rule <img class="equation_image" title=" \displaystyle f=6 - 6 x \implies f'=-6 " src="/equation_images/%20%5Cdisplaystyle%20f%3D6%20-%206%20x%20%5Cimplies%20f%27%3D-6%20" alt="LaTeX: \displaystyle f=6 - 6 x \implies f'=-6 " data-equation-content=" \displaystyle f=6 - 6 x \implies f'=-6 " /> and <img class="equation_image" title=" \displaystyle g=4 - 6 x \implies g'=-6 " src="/equation_images/%20%5Cdisplaystyle%20g%3D4%20-%206%20x%20%5Cimplies%20g%27%3D-6%20" alt="LaTeX: \displaystyle g=4 - 6 x \implies g'=-6 " data-equation-content=" \displaystyle g=4 - 6 x \implies g'=-6 " /> . Popping up a level gives <img class="equation_image" title=" \displaystyle g'=(4 - 6 x)(-6)+(6 - 6 x)(-6) " src="/equation_images/%20%5Cdisplaystyle%20g%27%3D%284%20-%206%20x%29%28-6%29%2B%286%20-%206%20x%29%28-6%29%20" alt="LaTeX: \displaystyle g'=(4 - 6 x)(-6)+(6 - 6 x)(-6) " data-equation-content=" \displaystyle g'=(4 - 6 x)(-6)+(6 - 6 x)(-6) " /> Popping up again (Back to the original problem) gives <img class="equation_image" title=" \displaystyle f'=(- 9 x - 7)(72 x - 60)+(\left(4 - 6 x\right) \left(6 - 6 x\right))(-9)=- 6 \left(4 - 6 x\right) \left(- 9 x - 7\right) + \left(6 - 6 x\right) \left(54 x - 36\right) + \left(6 - 6 x\right) \left(54 x + 42\right) " src="/equation_images/%20%5Cdisplaystyle%20f%27%3D%28-%209%20x%20-%207%29%2872%20x%20-%2060%29%2B%28%5Cleft%284%20-%206%20x%5Cright%29%20%5Cleft%286%20-%206%20x%5Cright%29%29%28-9%29%3D-%206%20%5Cleft%284%20-%206%20x%5Cright%29%20%5Cleft%28-%209%20x%20-%207%5Cright%29%20%2B%20%5Cleft%286%20-%206%20x%5Cright%29%20%5Cleft%2854%20x%20-%2036%5Cright%29%20%2B%20%5Cleft%286%20-%206%20x%5Cright%29%20%5Cleft%2854%20x%20%2B%2042%5Cright%29%20" alt="LaTeX: \displaystyle f'=(- 9 x - 7)(72 x - 60)+(\left(4 - 6 x\right) \left(6 - 6 x\right))(-9)=- 6 \left(4 - 6 x\right) \left(- 9 x - 7\right) + \left(6 - 6 x\right) \left(54 x - 36\right) + \left(6 - 6 x\right) \left(54 x + 42\right) " data-equation-content=" \displaystyle f'=(- 9 x - 7)(72 x - 60)+(\left(4 - 6 x\right) \left(6 - 6 x\right))(-9)=- 6 \left(4 - 6 x\right) \left(- 9 x - 7\right) + \left(6 - 6 x\right) \left(54 x - 36\right) + \left(6 - 6 x\right) \left(54 x + 42\right) " /> </p> </p>