Factoring by groups
(
6
x
+
7
)
(
4
x
2
-
8
x
-
10
)
+
(
6
x
+
7
)
(
5
x
2
+
4
x
-
4
)
=
(
6
x
+
7
)
[
(
4
x
2
-
8
x
-
10
)
+
(
5
x
2
+
4
x
-
4
)
]
(
6
x
+
7
)
[
(
4
x
2
+
5
x
2
)
+
(
-8
x
+
4
x
)
+
(
-10
-
4
)
]
=
(
6
x
+
7
)
(
9
x
2
-
4
x
-
14
)
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Copyright © Dayal D. Purohit, Ph.D.(Mathematics)