using algebraic identities(3x+5y) (3x+5y)
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Since
(
a
+
b
)
(
a
−
b
)
=
a
2
−
b
2
we can write
(
3
x
+
5
y
)
(
3
x
−
5
y
)
=
(
3
x
)
2
−
(
5
y
)
2
=
9
x
2
−
25
y
2
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