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Problem
Problem
The normals at three points
P
,
Q
,
R
P, Q, R
P
,
Q
,
R
of the parabola
y
2
=
4
a
x
y^2 = 4ax
y
2
=
4
a
x
meet in
(
h
,
k
)
(h, k)
(
h
,
k
)
. The centroid of
Δ
P
Q
R
\Delta PQR
Δ
P
QR
lies on a.
x
=
0
x = 0
x
=
0
b.
y
=
0
y = 0
y
=
0
c.
x
=
−
a
x = -a
x
=
−
a
d.
y
=
a
y = a
y
=
a
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