Factoring by groups
(
10
x
+
1
)
(
8
x
2
-
6
x
-
5
)
-
(
10
x
+
1
)
(
5
x
2
+
6
x
+
6
)
=
(
10
x
+
1
)
[
(
8
x
2
-
6
x
-
5
)
-
(
5
x
2
+
6
x
+
6
)
]
(
10
x
+
1
)
[
(
8
x
2
-
5
x
2
)
+
(
-6
x
-
6
x
)
+
(
-5
-
6
)
]
=
(
10
x
+
1
)
(
3
x
2
-
12
x
-
11
)
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Copyright © Dayal D. Purohit, Ph.D.(Mathematics)