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Factor \(\displaystyle - 12 x^{3} - 8 x^{2} + 30 x + 20\).

Factoring out the GCF \(\displaystyle -2\) from each term gives \(\displaystyle -2(6 x^{3} + 4 x^{2} - 15 x - 10)\). Grouping the first two terms and factoring out their GCF, \(\displaystyle 2 x^{2}\), gives \(\displaystyle 2 x^{2}(3 x + 2)\). Grouping the last two terms and factoring out their GCF, \(\displaystyle -5\), gives \(\displaystyle -5(3 x + 2)\). The polynomial now has a common binomial factor of \(\displaystyle 3 x + 2\). This gives \(\displaystyle -2[2 x^{2} \left(3 x + 2\right) -5 \cdot \left(3 x + 2\right)] = -2\left(3 x + 2\right) \left(2 x^{2} - 5\right)\).

Download \(\LaTeX\) 

\begin{question}Factor $- 12 x^{3} - 8 x^{2} + 30 x + 20$. 
    \soln{9cm}{Factoring out the GCF $-2$ from each term gives $-2(6 x^{3} + 4 x^{2} - 15 x - 10)$. Grouping the first two terms and factoring out their GCF, $2 x^{2}$, gives $2 x^{2}(3 x + 2)$. Grouping the last two terms and factoring out their GCF, $-5$, gives $-5(3 x + 2)$. The polynomial now has a common binomial factor of $3 x + 2$. This gives $-2[2 x^{2} \left(3 x + 2\right) -5 \cdot \left(3 x + 2\right)] = -2\left(3 x + 2\right) \left(2 x^{2} - 5\right)$. }

\end{question}

Download Question and Solution Environment\(\LaTeX\)
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HTML for Canvas 
<p> <p>Factor  <img class="equation_image" title=" \displaystyle - 12 x^{3} - 8 x^{2} + 30 x + 20 " src="/equation_images/%20%5Cdisplaystyle%20-%2012%20x%5E%7B3%7D%20-%208%20x%5E%7B2%7D%20%2B%2030%20x%20%2B%2020%20" alt="LaTeX:  \displaystyle - 12 x^{3} - 8 x^{2} + 30 x + 20 " data-equation-content=" \displaystyle - 12 x^{3} - 8 x^{2} + 30 x + 20 " /> . </p> </p>
HTML for Canvas
<p> <p>Factoring out the GCF  <img class="equation_image" title=" \displaystyle -2 " src="/equation_images/%20%5Cdisplaystyle%20-2%20" alt="LaTeX:  \displaystyle -2 " data-equation-content=" \displaystyle -2 " />  from each term gives  <img class="equation_image" title=" \displaystyle -2(6 x^{3} + 4 x^{2} - 15 x - 10) " src="/equation_images/%20%5Cdisplaystyle%20-2%286%20x%5E%7B3%7D%20%2B%204%20x%5E%7B2%7D%20-%2015%20x%20-%2010%29%20" alt="LaTeX:  \displaystyle -2(6 x^{3} + 4 x^{2} - 15 x - 10) " data-equation-content=" \displaystyle -2(6 x^{3} + 4 x^{2} - 15 x - 10) " /> . Grouping the first two terms and factoring out their GCF,  <img class="equation_image" title=" \displaystyle 2 x^{2} " src="/equation_images/%20%5Cdisplaystyle%202%20x%5E%7B2%7D%20" alt="LaTeX:  \displaystyle 2 x^{2} " data-equation-content=" \displaystyle 2 x^{2} " /> , gives  <img class="equation_image" title=" \displaystyle 2 x^{2}(3 x + 2) " src="/equation_images/%20%5Cdisplaystyle%202%20x%5E%7B2%7D%283%20x%20%2B%202%29%20" alt="LaTeX:  \displaystyle 2 x^{2}(3 x + 2) " data-equation-content=" \displaystyle 2 x^{2}(3 x + 2) " /> . Grouping the last two terms and factoring out their GCF,  <img class="equation_image" title=" \displaystyle -5 " src="/equation_images/%20%5Cdisplaystyle%20-5%20" alt="LaTeX:  \displaystyle -5 " data-equation-content=" \displaystyle -5 " /> , gives  <img class="equation_image" title=" \displaystyle -5(3 x + 2) " src="/equation_images/%20%5Cdisplaystyle%20-5%283%20x%20%2B%202%29%20" alt="LaTeX:  \displaystyle -5(3 x + 2) " data-equation-content=" \displaystyle -5(3 x + 2) " /> . The polynomial now has a common binomial factor of  <img class="equation_image" title=" \displaystyle 3 x + 2 " src="/equation_images/%20%5Cdisplaystyle%203%20x%20%2B%202%20" alt="LaTeX:  \displaystyle 3 x + 2 " data-equation-content=" \displaystyle 3 x + 2 " /> . This gives  <img class="equation_image" title=" \displaystyle -2[2 x^{2} \left(3 x + 2\right) -5 \cdot \left(3 x + 2\right)] = -2\left(3 x + 2\right) \left(2 x^{2} - 5\right) " src="/equation_images/%20%5Cdisplaystyle%20-2%5B2%20x%5E%7B2%7D%20%5Cleft%283%20x%20%2B%202%5Cright%29%20-5%20%5Ccdot%20%5Cleft%283%20x%20%2B%202%5Cright%29%5D%20%3D%20-2%5Cleft%283%20x%20%2B%202%5Cright%29%20%5Cleft%282%20x%5E%7B2%7D%20-%205%5Cright%29%20" alt="LaTeX:  \displaystyle -2[2 x^{2} \left(3 x + 2\right) -5 \cdot \left(3 x + 2\right)] = -2\left(3 x + 2\right) \left(2 x^{2} - 5\right) " data-equation-content=" \displaystyle -2[2 x^{2} \left(3 x + 2\right) -5 \cdot \left(3 x + 2\right)] = -2\left(3 x + 2\right) \left(2 x^{2} - 5\right) " /> . </p> </p>