#### Answer

domain$:\quad \mathbb{R}=(-\infty,\infty)$
range$:\quad [-2,\infty)$

#### Work Step by Step

$f(x)= ax^{2}+b\mathrm{x}+c \quad $or $\quad f(x)=a(x-h)^{2}+k$
A quadratic function is defined for all real numbers,
domain$:\quad \mathbb{R}=(-\infty,\infty)$
The graph of f(x) is a parabola.
If the parabola opens up, the vertex is its minimum point.
At $x=-1$ the minimum of $f(x)$ is $-2.$
The range of f is $[-2,\infty) $