[填空题]
Consider the functiodtw m x 25ashfpa/74lm*:eah5l)e pu(z;yoq1v pe8t7;; poqi n $ f(x)=\frac{4 x^{2}+p x}{x+1}$ , where $x \neq-1$ and $p \in \mathbb{R}$ .
Find the value of p for which the graph of f has exactly one point with a gradient of zero.
