7. Let the quadratic function $f(x)=a x^{2}+b x+2(a \neq 0)$, and for any real number $x$, it always holds that $|f(x)| \geqslant 2$, then the coordinates of the focus of this parabola are $\qquad$ .
7. $\left(0, \frac{1}{4 a}+2\right)$. When $x=0$, $y=2$. And for any real number $x$, $|f(x)| \geqslant 2$, so $x=0$ is the axis of symmetry of the parabola $y=$ $a x^{2}+b x+2$, and $a>0$.