Factoring by groups
(
8
x
+
1
)
(
x
2
-
5
x
-
4
)
-
(
8
x
+
1
)
(
6
x
2
+
x
+
3
)
=
(
8
x
+
1
)
[
(
x
2
-
5
x
-
4
)
-
(
6
x
2
+
x
+
3
)
]
(
8
x
+
1
)
[
(
x
2
-
6
x
2
)
+
(
-5
x
-
x
)
+
(
-4
-
3
)
]
=
(
8
x
+
1
)
(
-5
x
2
-
6
x
-
7
)
-
(
8
x
+
1
)
(
5
x
2
+
6
x
+
7
)
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Copyright © Dayal D. Purohit, Ph.D.(Mathematics)