Answers

2016-07-12T20:48:28+08:00
X (squared) = 8y
4p over 4 = 8y is over to 4 
p=2y 
graph :
vertex:(0,0)
directrix: (-2)
focus:(0,2)
and its line of numbers is only in (-4,4)
therefore its range is in 1 and 2 sides of its graph 
so that we gets (-4,2) on the 2 side
and (2,4) in 1 side 
then we get a parabola :)

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