Factoring by groups
(
9
x
+
8
)
(
x
2
+
5
x
+
1
)
+
(
9
x
+
8
)
(
8
x
2
-
9
x
-
4
)
=
(
9
x
+
8
)
[
(
x
2
+
5
x
+
1
)
+
(
8
x
2
-
9
x
-
4
)
]
(
9
x
+
8
)
[
(
x
2
+
8
x
2
)
+
(
5
x
-
9
x
)
+
(
1
-
4
)
]
=
(
9
x
+
8
)
(
9
x
2
-
4
x
-
3
)
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Copyright © Dayal D. Purohit, Ph.D.(Mathematics)