Divide using synthetic division $$ ( 2x^{3}-7x^{2}-x+6 ) \div ( x-1 ) $$
Answer
The synthetic division table is:
$$ \begin{array}{c|rrrr}1&2&-7&-1&6\\& & 2& -5& \color{black}{-6} \\ \hline &\color{blue}{2}&\color{blue}{-5}&\color{blue}{-6}&\color{orangered}{0} \end{array} $$The solution is:
$$ \frac{ 2x^{3}-7x^{2}-x+6 }{ x-1 } = \color{blue}{2x^{2}-5x-6} $$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.
$$ \begin{array}{c|rrrr}\color{blue}{1}&2&-7&-1&6\\& & & & \\ \hline &&&& \end{array} $$Step 1 : Bring down the leading coefficient to the bottom row.
$$ \begin{array}{c|rrrr}1&\color{orangered}{ 2 }&-7&-1&6\\& & & & \\ \hline &\color{orangered}{2}&&& \end{array} $$Step 2 : Multiply by the number on the left, and carry the result into the next column: $ \color{blue}{ 1 } \cdot \color{blue}{ 2 } = \color{blue}{ 2 } $.
$$ \begin{array}{c|rrrr}\color{blue}{1}&2&-7&-1&6\\& & \color{blue}{2} & & \\ \hline &\color{blue}{2}&&& \end{array} $$Step 3 : Add down last column: $ \color{orangered}{ -7 } + \color{orangered}{ 2 } = \color{orangered}{ -5 } $
$$ \begin{array}{c|rrrr}1&2&\color{orangered}{ -7 }&-1&6\\& & \color{orangered}{2} & & \\ \hline &2&\color{orangered}{-5}&& \end{array} $$Step 4 : Multiply by the number on the left, and carry the result into the next column: $ \color{blue}{ 1 } \cdot \color{blue}{ \left( -5 \right) } = \color{blue}{ -5 } $.
$$ \begin{array}{c|rrrr}\color{blue}{1}&2&-7&-1&6\\& & 2& \color{blue}{-5} & \\ \hline &2&\color{blue}{-5}&& \end{array} $$Step 5 : Add down last column: $ \color{orangered}{ -1 } + \color{orangered}{ \left( -5 \right) } = \color{orangered}{ -6 } $
$$ \begin{array}{c|rrrr}1&2&-7&\color{orangered}{ -1 }&6\\& & 2& \color{orangered}{-5} & \\ \hline &2&-5&\color{orangered}{-6}& \end{array} $$Step 6 : Multiply by the number on the left, and carry the result into the next column: $ \color{blue}{ 1 } \cdot \color{blue}{ \left( -6 \right) } = \color{blue}{ -6 } $.
$$ \begin{array}{c|rrrr}\color{blue}{1}&2&-7&-1&6\\& & 2& -5& \color{blue}{-6} \\ \hline &2&-5&\color{blue}{-6}& \end{array} $$Step 7 : Add down last column: $ \color{orangered}{ 6 } + \color{orangered}{ \left( -6 \right) } = \color{orangered}{ 0 } $
$$ \begin{array}{c|rrrr}1&2&-7&-1&\color{orangered}{ 6 }\\& & 2& -5& \color{orangered}{-6} \\ \hline &\color{blue}{2}&\color{blue}{-5}&\color{blue}{-6}&\color{orangered}{0} \end{array} $$Bottom line represents the quotient $ \color{blue}{ 2x^{2}-5x-6 } $ with a remainder of $ \color{red}{ 0 } $.