Divide using synthetic division $$ ( 6x^{2}-8x-2 ) \div ( x-1 ) $$
Answer
The synthetic division table is:
$$ \begin{array}{c|rrr}1&6&-8&-2\\& & 6& \color{black}{-2} \\ \hline &\color{blue}{6}&\color{blue}{-2}&\color{orangered}{-4} \end{array} $$The solution is:
$$ \frac{ 6x^{2}-8x-2 }{ x-1 } = \color{blue}{6x-2} \color{red}{~-~} \frac{ \color{red}{ 4 } }{ x-1 } $$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.
$$ \begin{array}{c|rrr}\color{blue}{1}&6&-8&-2\\& & & \\ \hline &&& \end{array} $$Step 1 : Bring down the leading coefficient to the bottom row.
$$ \begin{array}{c|rrr}1&\color{orangered}{ 6 }&-8&-2\\& & & \\ \hline &\color{orangered}{6}&& \end{array} $$Step 2 : Multiply by the number on the left, and carry the result into the next column: $ \color{blue}{ 1 } \cdot \color{blue}{ 6 } = \color{blue}{ 6 } $.
$$ \begin{array}{c|rrr}\color{blue}{1}&6&-8&-2\\& & \color{blue}{6} & \\ \hline &\color{blue}{6}&& \end{array} $$Step 3 : Add down last column: $ \color{orangered}{ -8 } + \color{orangered}{ 6 } = \color{orangered}{ -2 } $
$$ \begin{array}{c|rrr}1&6&\color{orangered}{ -8 }&-2\\& & \color{orangered}{6} & \\ \hline &6&\color{orangered}{-2}& \end{array} $$Step 4 : Multiply by the number on the left, and carry the result into the next column: $ \color{blue}{ 1 } \cdot \color{blue}{ \left( -2 \right) } = \color{blue}{ -2 } $.
$$ \begin{array}{c|rrr}\color{blue}{1}&6&-8&-2\\& & 6& \color{blue}{-2} \\ \hline &6&\color{blue}{-2}& \end{array} $$Step 5 : Add down last column: $ \color{orangered}{ -2 } + \color{orangered}{ \left( -2 \right) } = \color{orangered}{ -4 } $
$$ \begin{array}{c|rrr}1&6&-8&\color{orangered}{ -2 }\\& & 6& \color{orangered}{-2} \\ \hline &\color{blue}{6}&\color{blue}{-2}&\color{orangered}{-4} \end{array} $$Bottom line represents the quotient $ \color{blue}{ 6x-2 } $ with a remainder of $ \color{red}{ -4 } $.