Factoring by groups
(
5
x
+
9
)
(
9
x
2
-
6
x
-
10
)
-
(
5
x
+
9
)
(
5
x
2
+
8
x
-
9
)
=
(
5
x
+
9
)
[
(
9
x
2
-
6
x
-
10
)
-
(
5
x
2
+
8
x
-
9
)
]
(
5
x
+
9
)
[
(
9
x
2
-
5
x
2
)
+
(
-6
x
-
8
x
)
+
(
-10
+
9
)
]
=
(
5
x
+
9
)
(
4
x
2
-
14
x
-
1
)
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Copyright © Dayal D. Purohit, Ph.D.(Mathematics)