1. The problem asks to write an equation for the function graphed above, which is a parabola.
2. The general form of a parabola's equation is $$y = a(x - h)^2 + k$$ where $(h,k)$ is the vertex and $a$ determines the direction and width.
3. From the description, the top-left graph is a downward-opening parabola with vertex near $(-4,8)$.
4. Since it opens downward, $a < 0$. We can use a point on the parabola to find $a$. The point $(-6,8)$ lies on it.
5. Substitute vertex and point into the formula:
$$8 = a(-6 + 4)^2 + 8$$
6. Simplify inside the square:
$$8 = a(-2)^2 + 8$$
$$8 = 4a + 8$$
7. Subtract 8 from both sides:
$$8 - 8 = 4a + 8 - 8$$
$$0 = 4a$$
8. Divide both sides by 4:
$$\cancel{\frac{0}{4}} = \cancel{\frac{4a}{4}}$$
$$0 = a$$
9. This means $a=0$, which would not form a parabola but a horizontal line. This suggests the point $(-6,8)$ is on the vertex line, so the parabola is flat at the vertex height.
10. Since the vertex is at $(-4,8)$ and the parabola opens downward, the simplest equation is:
$$y = -a(x + 4)^2 + 8$$
11. Without more points, we can only write the general form with $a > 0$:
$$y = -a(x + 4)^2 + 8$$
12. This represents the parabola with vertex at $(-4,8)$ opening downward.
Final answer:
$$y = -a(x + 4)^2 + 8$$ where $a > 0$.
Parabola Equation B96409
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