Divide using synthetic division $$ ( 3x^{2}-11x-4 ) \div ( x-1 ) $$
Answer
The synthetic division table is:
$$ \begin{array}{c|rrr}1&3&-11&-4\\& & 3& \color{black}{-8} \\ \hline &\color{blue}{3}&\color{blue}{-8}&\color{orangered}{-12} \end{array} $$The solution is:
$$ \frac{ 3x^{2}-11x-4 }{ x-1 } = \color{blue}{3x-8} \color{red}{~-~} \frac{ \color{red}{ 12 } }{ x-1 } $$Explanation
Step 1 : Write down the coefficients of the dividend into division table. Put the zero from $ x -1 = 0 $ ( $ x = \color{blue}{ 1 } $ ) at the left.
$$ \begin{array}{c|rrr}\color{blue}{1}&3&-11&-4\\& & & \\ \hline &&& \end{array} $$Step 1 : Bring down the leading coefficient to the bottom row.
$$ \begin{array}{c|rrr}1&\color{orangered}{ 3 }&-11&-4\\& & & \\ \hline &\color{orangered}{3}&& \end{array} $$Step 2 : Multiply by the number on the left, and carry the result into the next column: $ \color{blue}{ 1 } \cdot \color{blue}{ 3 } = \color{blue}{ 3 } $.
$$ \begin{array}{c|rrr}\color{blue}{1}&3&-11&-4\\& & \color{blue}{3} & \\ \hline &\color{blue}{3}&& \end{array} $$Step 3 : Add down last column: $ \color{orangered}{ -11 } + \color{orangered}{ 3 } = \color{orangered}{ -8 } $
$$ \begin{array}{c|rrr}1&3&\color{orangered}{ -11 }&-4\\& & \color{orangered}{3} & \\ \hline &3&\color{orangered}{-8}& \end{array} $$Step 4 : Multiply by the number on the left, and carry the result into the next column: $ \color{blue}{ 1 } \cdot \color{blue}{ \left( -8 \right) } = \color{blue}{ -8 } $.
$$ \begin{array}{c|rrr}\color{blue}{1}&3&-11&-4\\& & 3& \color{blue}{-8} \\ \hline &3&\color{blue}{-8}& \end{array} $$Step 5 : Add down last column: $ \color{orangered}{ -4 } + \color{orangered}{ \left( -8 \right) } = \color{orangered}{ -12 } $
$$ \begin{array}{c|rrr}1&3&-11&\color{orangered}{ -4 }\\& & 3& \color{orangered}{-8} \\ \hline &\color{blue}{3}&\color{blue}{-8}&\color{orangered}{-12} \end{array} $$Bottom line represents the quotient $ \color{blue}{ 3x-8 } $ with a remainder of $ \color{red}{ -12 } $.