Factoring by groups
(
x
-
9
)
(
3
x
2
-
7
x
-
8
)
-
(
x
-
9
)
(
5
x
2
+
7
x
+
6
)
=
(
x
-
9
)
[
(
3
x
2
-
7
x
-
8
)
-
(
5
x
2
+
7
x
+
6
)
]
(
x
-
9
)
[
(
3
x
2
-
5
x
2
)
+
(
-7
x
-
7
x
)
+
(
-8
-
6
)
]
=
(
x
-
9
)
(
-2
x
2
-
14
x
-
14
)
-
(
x
-
9
)
(
2
x
2
+
14
x
+
14
)
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Copyright © Dayal D. Purohit, Ph.D.(Mathematics)