Answer
$x^{3}-3x^{2}-19x+36$
Work Step by Step
$ \begin{array}{ccccccc}
& & & & x^{2} & -7x & +9\\
& & & & & x & +4\\
& & & & -- & -- & --\\
& & & & 4x^{2} & -28x & +36\\
& & & x^{3} & -7x^{2} & +9x & \\
\hline & & & & & & \\
& & & x^{3} & -3x^{2} & -19x & +36
\end{array} \qquad \begin{array}{l}
.\\
.\\
.\\
\leftarrow 4(x^{2}-7x+9)\\
\leftarrow x(x^{2}-7x+9)\\
\\
\leftarrow\text{combine }
\end{array}$