Answer
$2$
Work Step by Step
Remainder Theorem:
If the polynomial $P(x)$ is divided by $x-c$ , then the remainder is the value $P(c)$ .
$\left.\begin{array}{l}
-1 \ \lfloor \\ \\ \\ \end{array}\right.\begin{array}{rrrrr}
1 & -1 & 1 & 5 \\\hline
& -1 & 2 & -3 \\\hline
1 & -2 & 3 &|\ \ \ 2 \end{array}$
$R(x)=P(-1)=2$
