Question: In Example 3(b), change 9y to 7y. Data from Example 3(b) The parabola 2x 2 = 9y fits the form of Eq. (21.16) if we
In Example 3(b), change −9y to 7y.
Data from Example 3(b)
The parabola 2x2 = −9y fits the form of Eq. (21.16) if we write it in the form
Here, we see that 4 p = −9/2. Therefore, its axis is along the y-axis, and its vertex is at the origin. Because 4 p = −9/2, we have
The parabola opens downward, as shown in Fig. 21.48.
x || 9 2
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