Answer
$-3$
Work Step by Step
Remainder Theorem:
If the polynomial $P(x)$ is divided by $x-c$ , then the remainder is the value $P(c)$ .
$\left.\begin{array}{l}
-1 \ \lfloor \\ \\ \\ \end{array}\right.\begin{array}{rrrrr}
4 & 12 & 5 \\\hline
& -4 & -8 \\\hline
4 & 8 &|\ \ \ -3 \end{array}$
$R(x)=P(-1)=-3$
