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Mathematics
Problem
Three parabolas are sketched on the same axes: P₁:
y
2
=
−
9
x
y^{2}=-9x
y
2
=
−
9
x
, P₂:
x
2
=
16
y
x^{2}=16y
x
2
=
16
y
, P₃:
y
2
=
4
x
y^{2}=4x
y
2
=
4
x
. Which of the following orders lists them from the narrowest opening to the widest opening? a)
P
1
,
P
3
,
P
2
P_1,\, P_3,\, P_2
P
1
,
P
3
,
P
2
b)
P
3
,
P
2
,
P
1
P_3,\, P_2,\, P_1
P
3
,
P
2
,
P
1
c)
P
3
,
P
1
,
P
2
P_3,\, P_1,\, P_2
P
3
,
P
1
,
P
2
d)
P
2
,
P
1
,
P
3
P_2,\, P_1,\, P_3
P
2
,
P
1
,
P
3
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