3. If the inequality $0 \leqslant x^{2}+p x+5 \leqslant 1$ has exactly one real solution, then the range of values for $p$ is $\qquad$ .
3. $p= \pm 4$.

According to the problem, the parabola $y=x^{2}+p x+5$ is tangent to the line $y=1$, $x^{2}+p x+5=1$, and by $\Delta=0$ we can get $p=$ $\pm 4$