Divide using synthetic division $$ ( x^{3}-8x^{2}+17x-10 ) \div ( x+2 ) $$
Answer
The synthetic division table is:
$$ \begin{array}{c|rrrr}-2&1&-8&17&-10\\& & -2& 20& \color{black}{-74} \\ \hline &\color{blue}{1}&\color{blue}{-10}&\color{blue}{37}&\color{orangered}{-84} \end{array} $$The solution is:
$$ \frac{ x^{3}-8x^{2}+17x-10 }{ x+2 } = \color{blue}{x^{2}-10x+37} \color{red}{~-~} \frac{ \color{red}{ 84 } }{ x+2 } $$Explanation
Step 1 : Write down the coefficients of the dividend into division table. Put the zero from $ x + 2 = 0 $ ( $ x = \color{blue}{ -2 } $ ) at the left.
$$ \begin{array}{c|rrrr}\color{blue}{-2}&1&-8&17&-10\\& & & & \\ \hline &&&& \end{array} $$Step 1 : Bring down the leading coefficient to the bottom row.
$$ \begin{array}{c|rrrr}-2&\color{orangered}{ 1 }&-8&17&-10\\& & & & \\ \hline &\color{orangered}{1}&&& \end{array} $$Step 2 : Multiply by the number on the left, and carry the result into the next column: $ \color{blue}{ -2 } \cdot \color{blue}{ 1 } = \color{blue}{ -2 } $.
$$ \begin{array}{c|rrrr}\color{blue}{-2}&1&-8&17&-10\\& & \color{blue}{-2} & & \\ \hline &\color{blue}{1}&&& \end{array} $$Step 3 : Add down last column: $ \color{orangered}{ -8 } + \color{orangered}{ \left( -2 \right) } = \color{orangered}{ -10 } $
$$ \begin{array}{c|rrrr}-2&1&\color{orangered}{ -8 }&17&-10\\& & \color{orangered}{-2} & & \\ \hline &1&\color{orangered}{-10}&& \end{array} $$Step 4 : Multiply by the number on the left, and carry the result into the next column: $ \color{blue}{ -2 } \cdot \color{blue}{ \left( -10 \right) } = \color{blue}{ 20 } $.
$$ \begin{array}{c|rrrr}\color{blue}{-2}&1&-8&17&-10\\& & -2& \color{blue}{20} & \\ \hline &1&\color{blue}{-10}&& \end{array} $$Step 5 : Add down last column: $ \color{orangered}{ 17 } + \color{orangered}{ 20 } = \color{orangered}{ 37 } $
$$ \begin{array}{c|rrrr}-2&1&-8&\color{orangered}{ 17 }&-10\\& & -2& \color{orangered}{20} & \\ \hline &1&-10&\color{orangered}{37}& \end{array} $$Step 6 : Multiply by the number on the left, and carry the result into the next column: $ \color{blue}{ -2 } \cdot \color{blue}{ 37 } = \color{blue}{ -74 } $.
$$ \begin{array}{c|rrrr}\color{blue}{-2}&1&-8&17&-10\\& & -2& 20& \color{blue}{-74} \\ \hline &1&-10&\color{blue}{37}& \end{array} $$Step 7 : Add down last column: $ \color{orangered}{ -10 } + \color{orangered}{ \left( -74 \right) } = \color{orangered}{ -84 } $
$$ \begin{array}{c|rrrr}-2&1&-8&17&\color{orangered}{ -10 }\\& & -2& 20& \color{orangered}{-74} \\ \hline &\color{blue}{1}&\color{blue}{-10}&\color{blue}{37}&\color{orangered}{-84} \end{array} $$Bottom line represents the quotient $ \color{blue}{ x^{2}-10x+37 } $ with a remainder of $ \color{red}{ -84 } $.