1
.
3x²
+
5
x
+
2
=
[
(
3x
)
²
+
5
(
____________________
)
+
6
]
/
3
=
[
(
3x
+
____________________
)
(
3x
+
____________________
)
]
/
3
=
(
x
+
1
)
(
3x
+
2
)
2
.
6x²
-
13
x
+
7
=
[
(
____________________
)
²
-
____________________
(
6x
)
+
42
]
/
6
=
[
(
6x
-
____________________
)
(
6x
-
____________________
)
]
/
6
=
(
6x
-
7
)
(
x
+
1
)
3
.
7x²
-
8
x
+
1
=
[
(
7x
)
²
-
8
(
7x
)
+
____________________
]
/
7
=
[
(
7x
-
____________________
)
(
7x
-
____________________
)
]
/
7
=
(
x
-
1
)
(
7x
-
1
)
4
.
3x
?
-
3
x³
-
6
=
[
(
3x³
)
²
-
3
(
____________________
)
-
18
]
/
3
=
[
(
3x³
-
____________________
)
(
3x³
+
____________________
)
]
/
3
=
3
(
x³
-
2
)
(
x³
+
1
)
5
.
5x
?
-
16
x²
+
3
=
[
(
5x²
)
²
-
16
(
____________________
)
+
15
]
/
5
=
[
(
5x²
-
____________________
)
(
5x²
-
____________________
)
]
/
5
=
(
x²
-
3
)
(
5x²
-
1
)
