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Byju's Answer
Standard VII
Mathematics
(a+b)(a-b) Expansion and Visualisation
Using apporpr...
Question
Using apporpriate identity, factorize
9
x
2
+
6
x
+
1
.
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Solution
9
x
2
+
6
x
+
1
=
3
2
x
2
+
6
x
+
1
2
=
(
3
x
)
2
+
6
x
+
1
2
=
(
3
x
)
2
+
2
(
3
x
)
(
1
)
+
1
2
Using identity:
(
a
+
b
)
2
=
a
2
+
2
a
b
+
b
2
whereas,
a
=
3
x
,
b
=
1
=
(
3
x
+
1
)
2
=
(
3
x
+
1
)
(
3
x
+
1
)
Hence
9
x
2
+
6
x
+
1
=
(
3
x
+
1
)
(
3
x
+
1
)
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