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Byju's Answer
Standard VIII
Mathematics
Multiplication of Monomials
Expand 3x+9...
Question
Expand
(
3
x
+
9
)
(
3
x
−
9
)
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Solution
(
3
x
+
9
)
(
3
x
−
9
)
=
9
x
2
−
81
using the identity
(
a
−
b
)
(
a
+
b
)
=
a
2
−
b
2
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