1. The problem is to identify the equation of a cubic function given its graph characteristics.
2. The graph has x-intercepts at approximately $x = -2$, $x = 1$, and $x = 3$. This means the roots of the cubic polynomial are $-2$, $1$, and $3$.
3. The general form of a cubic polynomial with roots $r_1$, $r_2$, and $r_3$ is:
$$y = (x - r_1)(x - r_2)(x - r_3)$$
4. Using the roots from the graph, the equation should be:
$$y = (x + 2)(x - 1)(x - 3)$$
5. Let's check the options:
- $y = (x + 2)(x - 1)(x - 3)$ matches the roots exactly.
- $y = (x + 2)(x - 2)^2$ has roots at $-2$ and $2$ (with multiplicity 2), which does not match the graph.
- $y = (x + 3)(x - 1)(x - 4)$ has roots at $-3$, $1$, and $4$, which does not match.
- $y = (x - 2)(x + 1)(x + 3)$ has roots at $2$, $-1$, and $-3$, which does not match.
6. The graph also shows a local maximum near $x = -1$ and a local minimum near $x = 2$, consistent with the shape of $y = (x + 2)(x - 1)(x - 3)$.
7. Therefore, the correct equation for the graph is:
$$y = (x + 2)(x - 1)(x - 3)$$
Cubic Equation 21Fd9F
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