Factoring by groups
(
3
x
+
6
)
(
4
x
+
1
)
+
(
3
x
+
6
)
(
6
x
2
-
10
x
-
10
)
=
(
3
x
+
6
)
[
(
4
x
+
1
)
+
(
6
x
2
-
10
x
-
10
)
]
(
3
x
+
6
)
[
(
6
x
2
)
+
(
4
x
-
10
x
)
+
(
1
-
10
)
]
=
(
3
x
+
6
)
(
6
x
2
-
6
x
-
9
)
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Copyright © Dayal D. Purohit, Ph.D.(Mathematics)