Divide using synthetic division $$ ( 3x^{4}+9x^{3}+11x^{2}+6x+24 ) \div ( x+2 ) $$
Answer
The synthetic division table is:
$$ \begin{array}{c|rrrrr}-2&3&9&11&6&24\\& & -6& -6& -10& \color{black}{8} \\ \hline &\color{blue}{3}&\color{blue}{3}&\color{blue}{5}&\color{blue}{-4}&\color{orangered}{32} \end{array} $$The solution is:
$$ \frac{ 3x^{4}+9x^{3}+11x^{2}+6x+24 }{ x+2 } = \color{blue}{3x^{3}+3x^{2}+5x-4} ~+~ \frac{ \color{red}{ 32 } }{ x+2 } $$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.
$$ \begin{array}{c|rrrrr}\color{blue}{-2}&3&9&11&6&24\\& & & & & \\ \hline &&&&& \end{array} $$Step 1 : Bring down the leading coefficient to the bottom row.
$$ \begin{array}{c|rrrrr}-2&\color{orangered}{ 3 }&9&11&6&24\\& & & & & \\ \hline &\color{orangered}{3}&&&& \end{array} $$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 } $.
$$ \begin{array}{c|rrrrr}\color{blue}{-2}&3&9&11&6&24\\& & \color{blue}{-6} & & & \\ \hline &\color{blue}{3}&&&& \end{array} $$Step 3 : Add down last column: $ \color{orangered}{ 9 } + \color{orangered}{ \left( -6 \right) } = \color{orangered}{ 3 } $
$$ \begin{array}{c|rrrrr}-2&3&\color{orangered}{ 9 }&11&6&24\\& & \color{orangered}{-6} & & & \\ \hline &3&\color{orangered}{3}&&& \end{array} $$Step 4 : Multiply by the number on the left, and carry the result into the next column: $ \color{blue}{ -2 } \cdot \color{blue}{ 3 } = \color{blue}{ -6 } $.
$$ \begin{array}{c|rrrrr}\color{blue}{-2}&3&9&11&6&24\\& & -6& \color{blue}{-6} & & \\ \hline &3&\color{blue}{3}&&& \end{array} $$Step 5 : Add down last column: $ \color{orangered}{ 11 } + \color{orangered}{ \left( -6 \right) } = \color{orangered}{ 5 } $
$$ \begin{array}{c|rrrrr}-2&3&9&\color{orangered}{ 11 }&6&24\\& & -6& \color{orangered}{-6} & & \\ \hline &3&3&\color{orangered}{5}&& \end{array} $$Step 6 : Multiply by the number on the left, and carry the result into the next column: $ \color{blue}{ -2 } \cdot \color{blue}{ 5 } = \color{blue}{ -10 } $.
$$ \begin{array}{c|rrrrr}\color{blue}{-2}&3&9&11&6&24\\& & -6& -6& \color{blue}{-10} & \\ \hline &3&3&\color{blue}{5}&& \end{array} $$Step 7 : Add down last column: $ \color{orangered}{ 6 } + \color{orangered}{ \left( -10 \right) } = \color{orangered}{ -4 } $
$$ \begin{array}{c|rrrrr}-2&3&9&11&\color{orangered}{ 6 }&24\\& & -6& -6& \color{orangered}{-10} & \\ \hline &3&3&5&\color{orangered}{-4}& \end{array} $$Step 8 : Multiply by the number on the left, and carry the result into the next column: $ \color{blue}{ -2 } \cdot \color{blue}{ \left( -4 \right) } = \color{blue}{ 8 } $.
$$ \begin{array}{c|rrrrr}\color{blue}{-2}&3&9&11&6&24\\& & -6& -6& -10& \color{blue}{8} \\ \hline &3&3&5&\color{blue}{-4}& \end{array} $$Step 9 : Add down last column: $ \color{orangered}{ 24 } + \color{orangered}{ 8 } = \color{orangered}{ 32 } $
$$ \begin{array}{c|rrrrr}-2&3&9&11&6&\color{orangered}{ 24 }\\& & -6& -6& -10& \color{orangered}{8} \\ \hline &\color{blue}{3}&\color{blue}{3}&\color{blue}{5}&\color{blue}{-4}&\color{orangered}{32} \end{array} $$Bottom line represents the quotient $ \color{blue}{ 3x^{3}+3x^{2}+5x-4 } $ with a remainder of $ \color{red}{ 32 } $.