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Factor \(\displaystyle - 54 x^{3} + 30 x^{2} + 54 x - 30\).


Factoring out the GCF \(\displaystyle -6\) from each term gives \(\displaystyle -6(9 x^{3} - 5 x^{2} - 9 x + 5)\). Grouping the first two terms and factoring out their GCF, \(\displaystyle x^{2}\), gives \(\displaystyle x^{2}(9 x - 5)\). Grouping the last two terms and factoring out their GCF, \(\displaystyle -1\), gives \(\displaystyle -1(9 x - 5)\). The polynomial now has a common binomial factor of \(\displaystyle 9 x - 5\). This gives \(\displaystyle -6[x^{2} \left(9 x - 5\right) -1 \cdot \left(9 x - 5\right)] = -6\left(9 x - 5\right) \left(x^{2} - 1\right)\). The quadratic factor can be factored using the difference of squares to give \(\displaystyle -6\left(x - 1\right) \left(x + 1\right) \left(9 x - 5\right). \)

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\begin{question}Factor $- 54 x^{3} + 30 x^{2} + 54 x - 30$. 
    \soln{9cm}{Factoring out the GCF $-6$ from each term gives $-6(9 x^{3} - 5 x^{2} - 9 x + 5)$. Grouping the first two terms and factoring out their GCF, $x^{2}$, gives $x^{2}(9 x - 5)$. Grouping the last two terms and factoring out their GCF, $-1$, gives $-1(9 x - 5)$. The polynomial now has a common binomial factor of $9 x - 5$. This gives $-6[x^{2} \left(9 x - 5\right) -1 \cdot \left(9 x - 5\right)] = -6\left(9 x - 5\right) \left(x^{2} - 1\right)$. The quadratic factor can be factored using the difference of squares to give $-6\left(x - 1\right) \left(x + 1\right) \left(9 x - 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 - 54 x^{3} + 30 x^{2} + 54 x - 30 " src="/equation_images/%20%5Cdisplaystyle%20-%2054%20x%5E%7B3%7D%20%2B%2030%20x%5E%7B2%7D%20%2B%2054%20x%20-%2030%20" alt="LaTeX:  \displaystyle - 54 x^{3} + 30 x^{2} + 54 x - 30 " data-equation-content=" \displaystyle - 54 x^{3} + 30 x^{2} + 54 x - 30 " /> . </p> </p>
HTML for Canvas
<p> <p>Factoring out the GCF  <img class="equation_image" title=" \displaystyle -6 " src="/equation_images/%20%5Cdisplaystyle%20-6%20" alt="LaTeX:  \displaystyle -6 " data-equation-content=" \displaystyle -6 " />  from each term gives  <img class="equation_image" title=" \displaystyle -6(9 x^{3} - 5 x^{2} - 9 x + 5) " src="/equation_images/%20%5Cdisplaystyle%20-6%289%20x%5E%7B3%7D%20-%205%20x%5E%7B2%7D%20-%209%20x%20%2B%205%29%20" alt="LaTeX:  \displaystyle -6(9 x^{3} - 5 x^{2} - 9 x + 5) " data-equation-content=" \displaystyle -6(9 x^{3} - 5 x^{2} - 9 x + 5) " /> . Grouping the first two terms and factoring out their GCF,  <img class="equation_image" title=" \displaystyle x^{2} " src="/equation_images/%20%5Cdisplaystyle%20x%5E%7B2%7D%20" alt="LaTeX:  \displaystyle x^{2} " data-equation-content=" \displaystyle x^{2} " /> , gives  <img class="equation_image" title=" \displaystyle x^{2}(9 x - 5) " src="/equation_images/%20%5Cdisplaystyle%20x%5E%7B2%7D%289%20x%20-%205%29%20" alt="LaTeX:  \displaystyle x^{2}(9 x - 5) " data-equation-content=" \displaystyle x^{2}(9 x - 5) " /> . Grouping the last two terms and factoring out their GCF,  <img class="equation_image" title=" \displaystyle -1 " src="/equation_images/%20%5Cdisplaystyle%20-1%20" alt="LaTeX:  \displaystyle -1 " data-equation-content=" \displaystyle -1 " /> , gives  <img class="equation_image" title=" \displaystyle -1(9 x - 5) " src="/equation_images/%20%5Cdisplaystyle%20-1%289%20x%20-%205%29%20" alt="LaTeX:  \displaystyle -1(9 x - 5) " data-equation-content=" \displaystyle -1(9 x - 5) " /> . The polynomial now has a common binomial factor of  <img class="equation_image" title=" \displaystyle 9 x - 5 " src="/equation_images/%20%5Cdisplaystyle%209%20x%20-%205%20" alt="LaTeX:  \displaystyle 9 x - 5 " data-equation-content=" \displaystyle 9 x - 5 " /> . This gives  <img class="equation_image" title=" \displaystyle -6[x^{2} \left(9 x - 5\right) -1 \cdot \left(9 x - 5\right)] = -6\left(9 x - 5\right) \left(x^{2} - 1\right) " src="/equation_images/%20%5Cdisplaystyle%20-6%5Bx%5E%7B2%7D%20%5Cleft%289%20x%20-%205%5Cright%29%20-1%20%5Ccdot%20%5Cleft%289%20x%20-%205%5Cright%29%5D%20%3D%20-6%5Cleft%289%20x%20-%205%5Cright%29%20%5Cleft%28x%5E%7B2%7D%20-%201%5Cright%29%20" alt="LaTeX:  \displaystyle -6[x^{2} \left(9 x - 5\right) -1 \cdot \left(9 x - 5\right)] = -6\left(9 x - 5\right) \left(x^{2} - 1\right) " data-equation-content=" \displaystyle -6[x^{2} \left(9 x - 5\right) -1 \cdot \left(9 x - 5\right)] = -6\left(9 x - 5\right) \left(x^{2} - 1\right) " /> . The quadratic factor can be factored using the difference of squares to give  <img class="equation_image" title=" \displaystyle -6\left(x - 1\right) \left(x + 1\right) \left(9 x - 5\right).  " src="/equation_images/%20%5Cdisplaystyle%20-6%5Cleft%28x%20-%201%5Cright%29%20%5Cleft%28x%20%2B%201%5Cright%29%20%5Cleft%289%20x%20-%205%5Cright%29.%20%20" alt="LaTeX:  \displaystyle -6\left(x - 1\right) \left(x + 1\right) \left(9 x - 5\right).  " data-equation-content=" \displaystyle -6\left(x - 1\right) \left(x + 1\right) \left(9 x - 5\right).  " /> </p> </p>