Factoring by groups
(
7
)
(
2
x
2
+
4
x
-
7
)
+
(
7
)
(
3
x
2
+
10
x
)
=
(
7
)
[
(
2
x
2
+
4
x
-
7
)
+
(
3
x
2
+
10
x
)
]
(
7
)
[
(
2
x
2
+
3
x
2
)
+
(
4
x
+
10
x
)
+
(
-7
)
]
=
(
7
)
(
5
x
2
+
14
x
-
7
)
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Copyright © Dayal D. Purohit, Ph.D.(Mathematics)