(1) Find the value range of m. ..
equation
x？
+
y？
+
x
-
6y
+
m
=
Can be translated into:
x？
+
x
+
1/4
+
y？
-
6y
+
nine
+
m
=
1/4
+
nine
Namely: (x
+
1/2)?
+
(y
-
3)?
=
nine
-
m
+
1/4
This equation represents a circle.
The square of the radius should be greater than zero.
Namely: 9
-
m
+
1/4
>
∴
m