Answer
$$\color{blue}{\bf{ -4 }}$$
Work Step by Step
We are given the two functions $\bf{f}$ and $\bf{g}$
$\bf{f(x) = x^2 + 3}$ and $\bf{g(x) = -2x + 6}$
and asked to find $\bf{( f-g )( -1 )}$
$(f-g)(-1)= f(-1) - (g(-1))$
$((-1)^2 + 3)-(-2(-1) + 6)$
$1 + 3-(2 + 6)$
$1 + 3-2 - 6$
$-4$
$$\color{blue}{\bf{ -4 }}$$
