Trinomial Factoring
9
x
2
+
15
x
+
4
=
9
x
2
+
3
x
+
12
x
+
4
=
3
x
(
3
x
+
1
)
+
4
(
3
x
+
1
)
=
(
3
x
+
1
)
(
3
x
+
4
)
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Copyright © Dayal D. Purohit, Ph.D.(Mathematics)