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