Divide using synthetic division $$ ( 4x^{5}+4x^{2}-6x+8 ) \div ( x-2 ) $$
Answer
The synthetic division table is:
$$ \begin{array}{c|rrrrrr}2&4&0&0&4&-6&8\\& & 8& 16& 32& 72& \color{black}{132} \\ \hline &\color{blue}{4}&\color{blue}{8}&\color{blue}{16}&\color{blue}{36}&\color{blue}{66}&\color{orangered}{140} \end{array} $$The solution is:
$$ \frac{ 4x^{5}+4x^{2}-6x+8 }{ x-2 } = \color{blue}{4x^{4}+8x^{3}+16x^{2}+36x+66} ~+~ \frac{ \color{red}{ 140 } }{ x-2 } $$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.
$$ \begin{array}{c|rrrrrr}\color{blue}{2}&4&0&0&4&-6&8\\& & & & & & \\ \hline &&&&&& \end{array} $$Step 1 : Bring down the leading coefficient to the bottom row.
$$ \begin{array}{c|rrrrrr}2&\color{orangered}{ 4 }&0&0&4&-6&8\\& & & & & & \\ \hline &\color{orangered}{4}&&&&& \end{array} $$Step 2 : Multiply by the number on the left, and carry the result into the next column: $ \color{blue}{ 2 } \cdot \color{blue}{ 4 } = \color{blue}{ 8 } $.
$$ \begin{array}{c|rrrrrr}\color{blue}{2}&4&0&0&4&-6&8\\& & \color{blue}{8} & & & & \\ \hline &\color{blue}{4}&&&&& \end{array} $$Step 3 : Add down last column: $ \color{orangered}{ 0 } + \color{orangered}{ 8 } = \color{orangered}{ 8 } $
$$ \begin{array}{c|rrrrrr}2&4&\color{orangered}{ 0 }&0&4&-6&8\\& & \color{orangered}{8} & & & & \\ \hline &4&\color{orangered}{8}&&&& \end{array} $$Step 4 : Multiply by the number on the left, and carry the result into the next column: $ \color{blue}{ 2 } \cdot \color{blue}{ 8 } = \color{blue}{ 16 } $.
$$ \begin{array}{c|rrrrrr}\color{blue}{2}&4&0&0&4&-6&8\\& & 8& \color{blue}{16} & & & \\ \hline &4&\color{blue}{8}&&&& \end{array} $$Step 5 : Add down last column: $ \color{orangered}{ 0 } + \color{orangered}{ 16 } = \color{orangered}{ 16 } $
$$ \begin{array}{c|rrrrrr}2&4&0&\color{orangered}{ 0 }&4&-6&8\\& & 8& \color{orangered}{16} & & & \\ \hline &4&8&\color{orangered}{16}&&& \end{array} $$Step 6 : Multiply by the number on the left, and carry the result into the next column: $ \color{blue}{ 2 } \cdot \color{blue}{ 16 } = \color{blue}{ 32 } $.
$$ \begin{array}{c|rrrrrr}\color{blue}{2}&4&0&0&4&-6&8\\& & 8& 16& \color{blue}{32} & & \\ \hline &4&8&\color{blue}{16}&&& \end{array} $$Step 7 : Add down last column: $ \color{orangered}{ 4 } + \color{orangered}{ 32 } = \color{orangered}{ 36 } $
$$ \begin{array}{c|rrrrrr}2&4&0&0&\color{orangered}{ 4 }&-6&8\\& & 8& 16& \color{orangered}{32} & & \\ \hline &4&8&16&\color{orangered}{36}&& \end{array} $$Step 8 : Multiply by the number on the left, and carry the result into the next column: $ \color{blue}{ 2 } \cdot \color{blue}{ 36 } = \color{blue}{ 72 } $.
$$ \begin{array}{c|rrrrrr}\color{blue}{2}&4&0&0&4&-6&8\\& & 8& 16& 32& \color{blue}{72} & \\ \hline &4&8&16&\color{blue}{36}&& \end{array} $$Step 9 : Add down last column: $ \color{orangered}{ -6 } + \color{orangered}{ 72 } = \color{orangered}{ 66 } $
$$ \begin{array}{c|rrrrrr}2&4&0&0&4&\color{orangered}{ -6 }&8\\& & 8& 16& 32& \color{orangered}{72} & \\ \hline &4&8&16&36&\color{orangered}{66}& \end{array} $$Step 10 : Multiply by the number on the left, and carry the result into the next column: $ \color{blue}{ 2 } \cdot \color{blue}{ 66 } = \color{blue}{ 132 } $.
$$ \begin{array}{c|rrrrrr}\color{blue}{2}&4&0&0&4&-6&8\\& & 8& 16& 32& 72& \color{blue}{132} \\ \hline &4&8&16&36&\color{blue}{66}& \end{array} $$Step 11 : Add down last column: $ \color{orangered}{ 8 } + \color{orangered}{ 132 } = \color{orangered}{ 140 } $
$$ \begin{array}{c|rrrrrr}2&4&0&0&4&-6&\color{orangered}{ 8 }\\& & 8& 16& 32& 72& \color{orangered}{132} \\ \hline &\color{blue}{4}&\color{blue}{8}&\color{blue}{16}&\color{blue}{36}&\color{blue}{66}&\color{orangered}{140} \end{array} $$Bottom line represents the quotient $ \color{blue}{ 4x^{4}+8x^{3}+16x^{2}+36x+66 } $ with a remainder of $ \color{red}{ 140 } $.