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Mathematics
Problem
The directrix of the parabola
x
2
−
4
x
−
8
y
+
12
=
0
x^2 - 4x - 8y + 12 = 0
x
2
−
4
x
−
8
y
+
12
=
0
is a.
y
=
0
y = 0
y
=
0
b.
x
=
1
x = 1
x
=
1
c.
y
=
−
1
y = -1
y
=
−
1
d.
x
=
−
1
x = -1
x
=
−
1
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