a²
+
____________________
+
9
=
(
a
+
____________________
)
²
b²
?
12b
+
____________________
=
(
____________________
?
6
)
²
a²
+
____________________
+
25
=
(
____________________
+
____________________
)
²
m²
?
____________________
+
49
=
(
____________________
?
____________________
)
²
x²
+
____________________
+
121
=
(
x
+
____________________
)
²
x²
?
8x
+
____________________
=
(
____________________
?
4
)
²
