Factoring by groups
(
8
x
+
4
)
(
3
x
2
+
4
x
-
9
)
-
(
8
x
+
4
)
(
6
x
2
+
5
)
=
(
8
x
+
4
)
[
(
3
x
2
+
4
x
-
9
)
-
(
6
x
2
+
5
)
]
(
8
x
+
4
)
[
(
3
x
2
-
6
x
2
)
+
(
4
x
)
+
(
-9
-
5
)
]
=
(
8
x
+
4
)
(
-3
x
2
+
4
x
-
14
)
-
(
8
x
+
4
)
(
3
x
2
-
4
x
+
14
)
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Copyright © Dayal D. Purohit, Ph.D.(Mathematics)