Divide using synthetic division $$ ( 3x^{2}-5x+7 ) \div ( x+2 ) $$
Answer
The synthetic division table is:
$$ \begin{array}{c|rrr}-2&3&-5&7\\& & -6& \color{black}{22} \\ \hline &\color{blue}{3}&\color{blue}{-11}&\color{orangered}{29} \end{array} $$The solution is:
$$ \frac{ 3x^{2}-5x+7 }{ x+2 } = \color{blue}{3x-11} ~+~ \frac{ \color{red}{ 29 } }{ x+2 } $$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.
$$ \begin{array}{c|rrr}\color{blue}{-2}&3&-5&7\\& & & \\ \hline &&& \end{array} $$Step 1 : Bring down the leading coefficient to the bottom row.
$$ \begin{array}{c|rrr}-2&\color{orangered}{ 3 }&-5&7\\& & & \\ \hline &\color{orangered}{3}&& \end{array} $$Step 2 : Multiply by the number on the left, and carry the result into the next column: $ \color{blue}{ -2 } \cdot \color{blue}{ 3 } = \color{blue}{ -6 } $.
$$ \begin{array}{c|rrr}\color{blue}{-2}&3&-5&7\\& & \color{blue}{-6} & \\ \hline &\color{blue}{3}&& \end{array} $$Step 3 : Add down last column: $ \color{orangered}{ -5 } + \color{orangered}{ \left( -6 \right) } = \color{orangered}{ -11 } $
$$ \begin{array}{c|rrr}-2&3&\color{orangered}{ -5 }&7\\& & \color{orangered}{-6} & \\ \hline &3&\color{orangered}{-11}& \end{array} $$Step 4 : Multiply by the number on the left, and carry the result into the next column: $ \color{blue}{ -2 } \cdot \color{blue}{ \left( -11 \right) } = \color{blue}{ 22 } $.
$$ \begin{array}{c|rrr}\color{blue}{-2}&3&-5&7\\& & -6& \color{blue}{22} \\ \hline &3&\color{blue}{-11}& \end{array} $$Step 5 : Add down last column: $ \color{orangered}{ 7 } + \color{orangered}{ 22 } = \color{orangered}{ 29 } $
$$ \begin{array}{c|rrr}-2&3&-5&\color{orangered}{ 7 }\\& & -6& \color{orangered}{22} \\ \hline &\color{blue}{3}&\color{blue}{-11}&\color{orangered}{29} \end{array} $$Bottom line represents the quotient $ \color{blue}{ 3x-11 } $ with a remainder of $ \color{red}{ 29 } $.