## Algebra 1: Common Core (15th Edition)

$x^{2}+x-20$
Make a table of products. $\begin{array}{rll} & x & -4\\ \hline x |& x^{2} & -4x\\ 5 |& 5x & -20 \end{array}$ Answer: $x^{2}-4x+5x-20$, or $x^{2}+x-20$.