Chapter 3, Polynomial and Rational Functions - Section 3.2 - Polynomial Functions and Their Graphs - 3.2 Exercises - Page 303: 51

$x$-intercepts: $0$ and $4$ $y$-intercept: $0$ local extrema at $(2, 4)$

The graph crosses the $x$-axis at $(0, 0)$ and $(4, 0)$. Thus, the $x$-intercepts are $0 \text{ and } 4$. The graph crosses the $y$-axis at $(0, 0)$. Thus, the $y$-intercept is $0$. The graph has a maximum at $(2, 4)$.