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    				| 1. | Find the coordinates of the focus, axis of the parabola, the equation of directrix and the length of the latus rectum for x2 = –9y | 
| Answer» The given equation is x2 = –9y. - 4a = -9 ⇒ b = 9/4 ∴Coordinates of the focus = (0, a ) =(0, - 9/4) Since the given equation involves x2, the axis of the parabola is the y-axis. | |