Factoring by groups
(
6
x
-
9
)
(
9
x
2
-
10
x
+
9
)
-
(
6
x
-
9
)
(
5
x
2
-
10
x
+
2
)
=
(
6
x
-
9
)
[
(
9
x
2
-
10
x
+
9
)
-
(
5
x
2
-
10
x
+
2
)
]
(
6
x
-
9
)
[
(
9
x
2
-
5
x
2
)
+
(
-10
x
+
10
x
)
+
(
9
-
2
)
]
=
(
6
x
-
9
)
(
4
x
2
+
7
)
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Copyright © Dayal D. Purohit, Ph.D.(Mathematics)