To describe a parabola with these characteristics, we can start with the general equation of a parabola:

$y = a(x - h)^2 + k$

Given Information:

1. Two zeros: This indicates the parabola crosses the x-axis at two points.
2. Opens downward: This means $a < 0$ (negative leading coefficient).
3. Wider than $y = x^2$: This indicates $|a| < 1$.
4. Axis of symmetry $x = 4$: The vertex is on this line, so $h = 4$.

Constructing the Equation:

1. The vertex is at $(4, k)$, but the value of $k$ is not directly given.
2. We assume the zeros are equidistant from the vertex, and the parabola opens downward.

Let the zeros be $(p, 0)$ and $(q, 0)$, and their midpoint will be the vertex. Hence:

p + q = 8 \quad \text{(since the axis of symmetry is x = 4)}.

Let’s write a possible equation based on these properties: $y = a(x - 4)^2 + k$ where $a < 0$ and $|a| < 1$.

If you have specific zeros or additional information (such as the $y$-intercept), we can refine this equation.

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Follow-Up Questions:

1. Do you know the specific zeros of the parabola?
2. Can you provide the vertex's $y$-coordinate ($k$) or another point on the parabola?
3. Should we assume a specific value of $a$ to explore further details?
4. Do you need the parabola to pass through a specific point?
5. Would you like to graph this parabola based on these properties?

Tip:

When a parabola is "wider," the coefficient $a$ controls the "stretch." A smaller $|a|$ results in a wider parabola.