Divide using synthetic division $$ ( -2x^{2}-53x-80 ) \div ( -9 ) $$
Answer
The synthetic division table is:
$$ \begin{array}{c|rrr}0&-2&-53&-80\\& & 0& \color{black}{0} \\ \hline &\color{blue}{-2}&\color{blue}{-53}&\color{orangered}{-80} \end{array} $$The solution is:
$$ \frac{ -2x^{2}-53x-80 }{ x } = \color{blue}{-2x-53} \color{red}{~-~} \frac{ \color{red}{ 80 } }{ x } $$Explanation
Step 1 : Write down the coefficients of the dividend into division table.Put the zero at the left.
$$ \begin{array}{c|rrr}\color{blue}{0}&-2&-53&-80\\& & & \\ \hline &&& \end{array} $$Step 1 : Bring down the leading coefficient to the bottom row.
$$ \begin{array}{c|rrr}0&\color{orangered}{ -2 }&-53&-80\\& & & \\ \hline &\color{orangered}{-2}&& \end{array} $$Step 2 : Multiply by the number on the left, and carry the result into the next column: $ \color{blue}{ 0 } \cdot \color{blue}{ \left( -2 \right) } = \color{blue}{ 0 } $.
$$ \begin{array}{c|rrr}\color{blue}{0}&-2&-53&-80\\& & \color{blue}{0} & \\ \hline &\color{blue}{-2}&& \end{array} $$Step 3 : Add down last column: $ \color{orangered}{ -53 } + \color{orangered}{ 0 } = \color{orangered}{ -53 } $
$$ \begin{array}{c|rrr}0&-2&\color{orangered}{ -53 }&-80\\& & \color{orangered}{0} & \\ \hline &-2&\color{orangered}{-53}& \end{array} $$Step 4 : Multiply by the number on the left, and carry the result into the next column: $ \color{blue}{ 0 } \cdot \color{blue}{ \left( -53 \right) } = \color{blue}{ 0 } $.
$$ \begin{array}{c|rrr}\color{blue}{0}&-2&-53&-80\\& & 0& \color{blue}{0} \\ \hline &-2&\color{blue}{-53}& \end{array} $$Step 5 : Add down last column: $ \color{orangered}{ -80 } + \color{orangered}{ 0 } = \color{orangered}{ -80 } $
$$ \begin{array}{c|rrr}0&-2&-53&\color{orangered}{ -80 }\\& & 0& \color{orangered}{0} \\ \hline &\color{blue}{-2}&\color{blue}{-53}&\color{orangered}{-80} \end{array} $$Bottom line represents the quotient $ \color{blue}{ -2x-53 } $ with a remainder of $ \color{red}{ -80 } $.