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Problem
Problem
If
2
x
+
y
+
1
−
f
=
0
2x + y + \frac{1}{-f} = 0
2
x
+
y
+
−
f
1
=
0
is a normal to the parabola
y
2
=
−
8
x
y^2 = -8x
y
2
=
−
8
x
, then the value of
1
−
f
\frac{1}{-f}
−
f
1
is a.
−
24
-24
−
24
b.
−
16
-16
−
16
c.
−
8
-8
−
8
d.
24
24
24
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