Factoring by groups
(
3
x
+
2
)
(
3
x
2
+
6
x
)
-
(
3
x
+
2
)
(
x
2
+
2
x
+
4
)
=
(
3
x
+
2
)
[
(
3
x
2
+
6
x
)
-
(
x
2
+
2
x
+
4
)
]
(
3
x
+
2
)
[
(
3
x
2
-
x
2
)
+
(
6
x
-
2
x
)
+
(
-4
)
]
=
(
3
x
+
2
)
(
2
x
2
+
4
x
-
4
)
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Copyright © Dayal D. Purohit, Ph.D.(Mathematics)