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Mathematics
Mathematics
Problem
71. Prove that a nondegenerate graph of the equation
A
x
2
+
C
y
2
+
D
x
+
E
y
+
F
=
0
A x^{2}+C y^{2}+D x+E y+F=0
A
x
2
+
C
y
2
+
D
x
+
E
y
+
F
=
0
is a hyperbola if
A
C
<
0
A C<0
A
C
<
0
.
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